Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Example Input: Context: Ten-year-old Chihiro (voice: Daveigh Chase in the 2002 English dub) and her parents (voices: Lauren Holly and Michael Chiklis) drive to their new home. Chihiro is whiny and unhappy about the move, especially when she notices that the bouquet her friend gave her as a good-bye gift is wilting. In sight of their new house, they take a wrong turn and follow a bumpy, decayed old road through the woods; Chihiro sees an odd old statue through the trees as they drive by. The road ends at a tunnel leading to an abandoned theme park. It gives Chihiro the creeps, but her parents persuade her to go in with them and look around.After wandering across a grassy landscape and a dry riverbed, they climb a stone staircase and come to a street lined with restaurants and shops. Most are deserted, but the aroma of cooking leads them to the one restaurant that's well stocked with food -- though it's mysteriously deserted. Mom and Dad are hungry and start eating, despite Chihiro's objections. The food is delicious, and Chihiro wanders away to explore while they eat. She finds a towering, ornate building that she recognizes as a bathhouse (a spa resort); there's a train track running under it. She meets a boy (voice: Jason Marsden) in traditional dress who is alarmed to see her; he tells her to leave and get back across the river before it gets dark. Chihiro runs back to her parents, but they're still eating -- and they've turned into pigs. Strange, dark, ghostly figures appear in all the shops and streets, frightening Chihiro and separating her from the pigs that were her parents. Chihiro runs back to the river, which was nearly dry when they came over but is now full and large, and she doesn't even recognize the buildings on the far side. As a riverboat approaches, she notices that her body has become transparent.The riverboat lands a big crowd of people in costume -- or maybe they're not people; at first they're only visible as paper masks. Chihiro thinks shes dreaming, but can't wake up. The boy who warned her away finds her and tells her she must eat some food from his world or she'll fade away. He assures her that she won't turn into a pig. She swallows the morsel he gives her and becomes solid, but finds that she's stuck to the ground until he recites an incantation to release her. A bird with a woman's head flies above them and he hides her, saying the bird is looking for her. They run through alleys and the pig barn to the big bathhouse, which is accessed by a bridge; the boy says she has to hold her breath as they cross the bridge or the spell that makes her invisible will be broken. Customers -- fantastically varied gods and spirits -- are crossing the bridge and being greeted by bathhouse staff. Chihiro makes it almost all the way across, but a frog (voice: Bob Bergen) that speaks to her companion (calling him Haku) startles her and she takes a breath. Luckily only the frog seems to see her, and Haku uses magic to encase it in a bubble to shut it up.Haku tells her to find Kamajii (voice: David Ogden Stiers), the boiler man, and make him give her a job; she must have a job to stay at the bathhouse, or else Yubaba (voice: Suzanne Pleshette), the old witch who rules the bathhouse, will turn her into an animal. And Haku says she has to stay if she wants to find and help her parents, who are still pigs, wherever they are. He knows her name and says he's known her since she was very small.Chihiro descends a steep, winding, rail-less wooden stairway in search of Kamajii and the boiler room. When she finds them, she sees a weird set-up in which the boiler is fed by creatures like spiders (delivering coal one lump at a time) and the machinery is controlled by a bearded, bald man 
 Question: Who used the black slug to control Haku?
Example Output: yubaba

Example Input: Context: One of the primary criticismes of vestibular schwannoma (VS) radiosurgery is that the risk of surgical morbidity is increased for patients whose tumor progresses after the procedures. We reviewed the French experience of operated patients after failed Gamma Knife radiosurgery. From July 1992 to January 2002, 25 out of the 1000 treated patients underwent another treatment procedure for a gamma knife failure. Excluding the NF2 patients, 21 patients have been operated and the present study shows the data collected for 20 of them. In order to analyze the difficulties observed during the surgery, a questionnaire was filled by the surgeons. The mean interval between radiosurgery and removal was 36 Months, from 10 to 83 Months. The mean increase in Volume was 559% (37 to 3036%, median 160%). Evolution of the Koos grading was found from 8 grade II, 10 grade III et 2 grade IV to 10 grade III and 10 grade IV. Patients have been operated for radiological tumor growth in 7 cases and for clinico-radiological evolution in 13 cases. In 9 cases, the surgeon considered that he had to face unusual difficulties mainly because of adhesion of the tumor to neurovascular structures. Tumor removal was total in 14 cases, near total in 4 cases and subtotal in 2 cases. One case of venous infarction was noticed at the second day following surgery responsible of hemiparesis and aphasia that gradually recovered. At last follow-up examination, facial nerve was normal (House and Brackmann grade I and II) in 10 cases while it was a grade III in 7 cases and grade IV and V in 3 cases. We recommend that the decision for surgical removal of growing vestibular schwannoma after Gamma Knife treatment should be done after a sufficiently long follow-up period. Our results show that the quality of removal and of facial nerve preservation might be impaired by radiosurgery in half of cases. However these results do not support a change in our policy of radiosurgical treatment of small to medium size vestibular schwannoma. 
 Question: Which disease can be categorized using the Koos grading system?
Example Output: vestibular schwannoma

Example Input: Context: Baghdad, in 2004, three soldiers of an Army bomb-disposal unit are investigating a report of an improvised explosive device (IED). They use a sophisticated robot drone to examine the device, which consists of several undetonated artillery shells wired together and hidden under plastic/fabric sheets. The unit, led by Sgt. Thompson, decides that they can detonate the IED using plastic explosives that they'll activate from a safe distance. Thompson also says that the explosion won't cause very much property damage and should result in no loss of life.A small cart is affixed to the back of the robot, which is then sent back into the blast zone. Before it can reach the IED, the trailer loses a wheel. Thompson dresses in a bulky bomb suit and walks down to the trailer. He picks it up and carries it to the IED, rigging it properly. As he walks back, his partners, Sgt. Sanborn and Specialist Eldridge, scan the immediate area for anyone they consider suspicious or who may be in the blast zone. When Thompson is about 25 meters from the bomb, but still in the kill zone, Eldridge notices a man running a butcher shop who is using a cellular phone. Eldridge yells to Sanborn and the specialist begins to run toward the man, ordering him to drop his phone. Sanborn tells Eldridge to shoot the man, who presses a sequence of numbers on the phone. The bomb detonates with Thompson still in the kill zone. The overpressure from the bomb kills Thompson despite the bomb suit; a large splash of blood hits the inside of the clear visor on his helmet.Thompson's body is packed into a coffin for shipment home, Sanborn supervises the procedure. He looks over Thompson's possessions for a few moments before the coffin is sealed. Back at the base, Eldridge is sitting in the rec room when the base psychologist, Lt. Col. Cambridge walks in and asks Eldridge how he's feeling (in the wake of Thompson's death). Eldridge is still clearly upset over the incident; he dry fires his rifle several times, suggesting that if he'd shot the man with the cell phone, Thompson might still be alive.A new leader for the team, Sgt. William James, arrives at the base. Sanborn meets him at his housing unit, where James is taking the plywood covers off his windows. When Sanborn suggests that James keep them on because of mortar shrapnel, James tells him that they won't be any good anyway if a mortar shell crashes in through the unit's roof.The next day the team responds to a report of another IED on a narrow street in the city. After the initial investigation, where they link up with the Army platoon that reported the bomb, James is dressed up in a suit similar to the one Thompson wore previously. As James approaches the bomb site, he tosses a smoke grenade, which agitates Sanborn, who can't see James to instruct him further. James also is uncommunicative with his team members, another factor that Sanborn does not appreciate. James finds an artillery shell buried under a small pile of trash. He disarms it easily, and then notices a secondary wire leading away from it. He uncovers the cable and finds it connects to a junction of six more cables. When James pulls on the junction connector, six more shells are uncovered. Another cable leads to a nearby building. James disarms the six new shells; as he does, he notices a man quickly leaving the building, presumably the bomber. James flashes one of the small detonators from one of the shells and smiles at the man, who vanishes from sight. Back at their Humvee, Sanborn tells James that he needs to communicate more during operations and not treat his duty as if it's a solo act. James brushes his teammate off. James does the same later when he and Sanborn talk while grooming themselves for another day's work in the latrine.The team is again called out for another bomb threat. This time, the bomb is in a car parked in front of a United Nations building. When the building is evacuated, James dons 
 Question: Who wants to return home and have a son?
Example Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
sanborn wants to return home and have a son.

