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: Was the person whose memoirs were translated by Obolensky a Russian general? Passage:Born in 1909 in the family of Orthodox princes Obolensky, from 1925 in exile in France, where, together with his father Nikolai Leonidovich Obolensky adopted Catholicism. He went to the Benedictines, where studied philosophy, and in 1943 he defended his doctoral degree from Pontifical Atheneum of St. Anselm in Rome. From 1935 he studied at Russicum. Ordained priest in 1940, Obolensky was sent to Paris, where he taught at Saint George Boarding in Meudon. He was also a member of the Congress of Russian Catholics in 1950 in Rome. Obolensky taught courses on the history of Russian literature and philosophy in Rome, Meudon and Bergamo. He worked as an expert on the Soviet Union in NATO. He was also author of books on the Soviet economy, translated the correspondence of Joseph Stalin, Franklin Roosevelt and Winston Churchill, and the memoirs of Georgy Zhukov and was engaged in the Soviet dissident literature. He died in 1992 in Belgium, the home of his sister.
Links: a. Franklin D. Roosevelt b. Georgy Zhukov c. Winston Churchill d. Meudon
Example Output: b

Example Input: Question: How long was the Nazi Party around for before Stahlecker joined it? Passage:On 1 May 1932, Stahlecker joined the Nazi Party (no. 3,219,015) as well as the SS (no. 73,041). On 29 May 1933, he was appointed deputy director of the Political Office of the Wurttemberg State Police. In 1934, he was appointed head of the Gestapo in the German state of Wurttemberg and soon assigned to the main office of the Sicherheitsdienst (SD). On 11 May 1937, he became head of the Gestapo in Breslau. After the incorporation of Austria in 1938, Stahlecker became SD chief of the Danube district (Vienna), a post he retained even after being promoted to SS-Standartenfuhrer. In the summer of 1938, Stahlecker became Inspector of the Security Police in Austria, succeeding Gestapo chief Heinrich Muller in that position. As of 20 August 1938, Stahlecker was the formal head of the Central Agency for Jewish Emigration in Vienna, though its de facto leader was Adolf Eichmann. Differences of opinion with Reinhard Heydrich motivated Stahlecker to move to the Auswartiges Amt (Foreign Office), after which he held posts as the commander of the Security Police and SD in the Protectorate of Bohemia and Moravia under SS-Brigadefuhrer Karl Hermann Frank. In mid-October 1939, Eichmann and Stahlecker decided to begin implementation of the Nisko Plan.
Links: a. Nazi Party b. Lublin Reservation c. Federal Foreign Office d. Brigadefuhrer
Example Output: a

Example Input: Question: How long had the Great Western Railway been in existence for the year Morris went to the West Indies? Passage:Leaving Collurian he worked as a porter at Penzance railway station for the Great Western Railway and with the free pass, that was part of his entitlement, he travelled to London to search for a post as a journalist. He landed his first job with The Dairy Farmer and later Farmers Weekly. He travelled to the West Indies in 1939 and Canada where he joined the Canadian Army at the outbreak of World War II, but was invalided out in 1941. Back in Britain, he started as a sub-editor on the Daily Express, and later as a personal assistant to Manny Shinwell, a Labour MP, writing speeches for members of the party. In 1949 he became political columnist for the Daily Mirror, and unsuccessfully standing as a Labour party candidate for Bristol West in 1950 and 1951.
Links: a. World War II b. Bristol West (UK Parliament constituency) c. Daily Express d. Great Western Railway
Example Output:
d