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: When was the school Gunnarsson attended from 1991 to 1992 founded? Passage:Gunnarsson was born in Borås, Sweden. Gunnarsson became a lieutenant in 1974 and he attended the Marine Corps Command and Staff College at the Marine Corps Base Quantico from 1991 to 1992. After his time at Quantico, Gunnarsson was posted to the Swedish Armed Forces Headquarters, Plans and Policy Directorate, as a section head. In 1994, he took command of one of the marine defense battalions in the Vaxholm Coastal Artillery Regiment (KA 1). Gunnarsson was commanding officer of the Marinens krigshögskola (MKHS) from 1995 to 1996 and was promoted to colonel in 1996. He was then sent to Croatia as Chief Military Observer of the United Nations Mission of Observers in Prevlaka (UNMOP) based out of Cavtat. Gunnarsson served as the first mission commander from January to November 1996. In 1997, he was promoted colonel 1st class, and posted as Chief of the Naval Staff. In 1999, he was promoted to major general and assumed the position of Assistant Head of Plans and Policy Directorate, Swedish Armed Forces Headquarters. This posting made him the Supreme Commander's main planner for long term planning and responsible for the Swedish Armed Forces' annual reports to the Ministry of Defence and the Riksdag. In 2002, Gunnarsson was promoted to lieutenant general and appointed head of the General Training and Management Directorate (Grundorganisationsledningen).
 Links: a. Marine Corps University b. United Nations Mission of Observers in Prevlaka c. Swedish Armed Forces d. Vaxholm Coastal Artillery Regiment
Example Output: a

Example Input: Question: Which state is Albert P. Laning a Senator for? Passage:The caucus of Democratic State legislators met on January 15, State Senator Albert P. Laning, of Buffalo, presided. All but one of the legislators were present, only Assemblyman John M. Roscoe, of Schoharie County, was sick. The caucus nominated Francis Kernan for the U.S. Senate. Kernan had been the Democratic/Liberal Republican candidate for Governor in November 1872 but had been defeated by John Adams Dix. Now Kernan was the choice of Tammany boss John Kelly who had succeeded the corrupt William M. Tweed. Kelly was opposed by John C. Jacobs, who proposed Ex-State Senator Henry C. Murphy, Jacobs's predecessor from the 3rd District, and the Democratic candidate who had lost the U.S. Senate elections in 1867 and 1869 when the Democrats were the minority. Kelly stood firm in his intention to dominate the Democratic Party, and had the caucus nomination made by viva voce vote instead of the more traditional secret ballot. Jacobs and Murphy had expected to get votes from many legislators who would not dare to cross Kelly openly, but had to abandon their hopes when the secret ballot was voted down 74 to 13.
 Links: a. Democratic Party (United States) b. Buffalo, New York c. John Kelly (New York politician) d. Voice vote
Example Output: b

Example Input: Question: Which organization is older between the weather service that monitors tropical cyclones in East Pacific and the one that monitors the West Pacific. Passage:Tropical cyclone activity in each basin is under the authority of an RSMC. The National Hurricane Center (NHC) is responsible for tropical cyclones in the North Atlantic and East Pacific. The Central Pacific Hurricane Center (CPHC) is responsible for tropical cyclones in the Central Pacific. Both the NHC and CPHC are subdivisions of the National Weather Service. Activity in the West Pacific is monitored by the Japan Meteorological Agency (JMA). Systems in the North Indian Ocean are monitored by the Indian Meteorological Department (IMD). The Météo-France located in Réunion (MFR) monitors tropical activity in the South-West Indian Ocean. The Australian region is monitored by five TCWCs that are under the coordination of the Australian Bureau of Meteorology (BOM). Similarly, the South Pacific is monitored by both the Fiji Meteorological Service (FMS) and the Meteorological Service of New Zealand Limited. Other, unofficial agencies that provide additional guidance in tropical cyclone monitoring include the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) and the Joint Typhoon Warning Center (JTWC).
 Links: a. PAGASA b. Joint Typhoon Warning Center c. India Meteorological Department d. National Hurricane Center
Example Output:
d