In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Example Input: Question: How many year does the person who appoints governors in India serve per term? Passage:In the Republic of India, a governor is the constitutional head of each of the twenty-eight states. The governor is appointed by the President of India for a term of five years, and holds office at the President's pleasure. The governor is de jure head of the state government; all its executive actions are taken in the governor's name. However, the governor must act on the advice of the popularly elected council of ministers, headed by the chief minister, which thus holds de facto executive authority at the state-level. The Constitution of India also empowers the governor to act upon his or her own discretion, such as the ability to appoint or dismiss a ministry, recommend President's rule, or reserve bills for the President's assent. Over the years, the exercise of these discretionary powers have given rise to conflict between the elected chief minister and the union government–appointed governor.
 Links: a. Government of India b. President of India c. Ministry (collective executive) d. Constitution of India
Example Output: b

Example Input: Question: How many regular NHL seasons had there been before the 1999-2000 hockey season? Passage:Before the 1999–2000 NHL season Torchetti was hired as an assistant coach for the Tampa Bay Lightning under Steve Ludzik. In 2002 Torchetti was hired as head coach of the San Antonio Rampage. Due to his many coaching stints in the city, "Torch" has kept close ties to San Antonio. After 65 games he was promoted to assistant coach with the parent club, the Florida Panthers. In 2004, he served 27 games as interim head coach, replacing Rick Dudley. He finished with a 10–12–4–1 record before being replaced by Jacques Martin. During the 2005–06 NHL season, Torchetti was hired by Dave Taylor as interim head coach of the Los Angeles Kings. With a chance to clinch a playoff spot, he had a 5–7 record in the team's final 12 games and was not retained by the Kings, instead being replaced by Marc Crawford.
 Links: a. 1999–2000 NHL season b. 1999–2000 NHL season c. Florida Panthers d. 2005–06 NHL season
Example Output: a

Example Input: Question: How many miles long is the river by which Charlie's isolated cabin was located? Passage:Charlie Biederman (November 11, 1918February 22, 1995) was a musher in Alaska best known for being the last surviving dog sled mail carrier in the United States. Charlie was born in Alaska as the son of Ed Biederman, a musher born in Bohemia who immigrated to the United States in 1874 and also delivered the mail via dog sled. The date of Charlie's birth is unclear, but contemporary U.S. Censuses indicate it likely was around 1919. Charlie had four siblings. Charlie was raised in Eagle, Alaska, but lived in an isolated cabin on the Yukon River for most of his life. From an early age, he assisted his father and brother in their winter deliveries of the mail to isolated cabins in central Alaska. In winter, the family lived in Eagle and ran the mail route between that town and Circle, another small settlement approximately downriver. In the summer, the family lived at their Yukon River cabin, harvesting fish for subsistence and boarding the dogs of fellow mushers. In 1938, the family were underbid for the main contract for mail delivery in the area by a bush pilot. Ed Biederman retired shortly afterward and died in 1945. The final dog sled mail route was replaced in 1963. That final route was from Gambell to Savoonga and was run by Chester Noongwook. In January 1995, he donated the mail-delivery sled he used to the National Postal Museum in Washington, D.C., where it hangs today. One month after making the delivery, he died on February 22, 1995.
 Links: a. Subsistence economy b. Subsistence economy c. Yukon River d. Bohemia
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
c

