Given the task definition, example input & output, solve the new input case.
In this task, you will be shown an extract from a movie plot. You need to read the extract and create questions that can be answered from the extract. Once you create a question you also need to provide the correct answer for it. Write your answer like "Question: your question, Answer: your answer". The questions should be well-formed and grammatically correct. The questions should be completely answerable from the given passage and should not require any external knowledge. Subjective questions are not allowed. Short answers containing words that are present in the passage are preferred. Create questions that result in factoid answers.  A simple rule of thumb to decide whether a question is a factoid or not is to see if two different people with average reading/comprehension skills would come up with the same answer after reading the passage.
Example: Twenty-year-old Will Hunting of South Boston is a self-taught, genius-level intellect, though he works as a janitor at the Massachusetts Institute of Technology and spends his free time drinking with his friends, Chuckie (Ben Affleck), Billy (Cole Hauser) and Morgan (Casey Affleck). When Professor Gerald Lambeau (Stellan Skarsgård) posts a difficult mathematics problem as a challenge for his graduate students, Will solves the problem anonymously, stunning both the graduate students and Lambeau himself. As a challenge to the unknown genius, Lambeau posts an even more difficult problem. Lambeau chances upon Will solving the problem but Will flees the scene. That night at a bar, Will meets Skylar (Minnie Driver), a British student about to graduate from Harvard, who plans on attending medical school at Stanford and gives Will her phone number before leaving.
Output: Question: How old is Will Hunting in the movie ?, Answer: Twenty years
This is a good question which results in a factoid answer, and the answer is correct too.

New input case for you: Key to understanding this movie is Milos Forman's own filmed "introduction" where he responds with faux seriousness to "the protests by firemen around the country and around the world" to his movie. He begins saying, "well you know it's really about firemen, it's about society ..." and then stops, smiles and says "But you know what? It _really is_ about Firemen." This movie was made in the last years before the beginning of the Prague Spring ...Now for the plot. A group of firemen at a station in a nondescript town somewhere in (still Communist) Czechoslovakia decides to honor its retiring chief at the upcoming firemen's ball. The planning committee for dance is hoping to put on a good dance, livening things up with a few small innovations. A raffle of prizes is promised as well as beauty pageant.Well, the committee proves to have no idea how to run a beauty pageant and as the dance continues the door prizes progressively get stolen. Finally, a fire strikes a house near the station. Distracted by the dance, the firefighters can't even get the fire truck out to the fire in time. The older man and his family who had lived in the house that has now largely burned down is found simply praying the "Our Father" as the helpless and rather embarrassed firefighters stand helplessly by...
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
Question: What is the key to understanding the movie?, Answer: The introduction.