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.

Ex Input:
Question: How long did the state entity that  Macedonia was the political heart of  last? Passage:In 1014, after decades of war, the Byzantine Emperor Basil II scored a decisive victory over the Bulgarian Emperor Samuil in the battle of Kleidion. Samuil died of a heart attack on 6 October 1014 and the Byzantines took the opportunity to penetrate deep into Macedonia, the political heart of the Bulgarian Empire, and seized a number of important cities (Bitola, Prilep, Voden, Maglen). After the new Bulgarian Emperor Ivan Vladislav, who in 1015 assassinated Samuil's son and heir Gavril Radomir, had unsuccessfully tried to make an agreement with Basil II, he organized the defense of the country. The Bulgarians led by the Emperor, Krakra of Pernik and Ivats managed to return a number of towns and castles. The Byzantines were defeated in the battle of Bitola (September 1015) and at the siege of Pernik (summer of 1016).
 Links: a. Basil II b. Ivan Vladislav of Bulgaria c. First Bulgarian Empire d. Prilep

Ex Output:
c


Ex Input:
Question: Who was the player of the year in the conference that Collins made first team of in 2008-09? Passage:Collins was the top returning scorer for the 2008–09 Kansas Jayhawks men's basketball team his junior year; every starter from the previous year's National Championship team graduated or departed for the NBA. Collins was on the early season Top 50 watchlist for the Naismith Award. He was also selected as being among the 17 Bob Cousy Award finalists, the Top 30 midseason Wooden Award candidates, the Top 30 midseason Naismith Award candidates and the Top 15 Oscar Robertson Trophy candidates. The team captain and vocal leader of the team, Collins was awarded the team's Danny Manning MVP award with Cole Aldrich following the season. Collins led the 2008–09 Jayhawks in points, minutes, assists and free-throw percentage. He led the team in scoring in 27 games, including the final 10 of the season. In the Big 12, he ranked third in scoring and fourth in assists. Collins made 35 consecutive free-throws over an eight-game span from January 10 – February 2 to set KU's all-time record. Over the course of the season he was named Big 12 Player of the Week three times. He was a unanimous selection to the 2008–09 Big 12 All-conference first team. He was a second-team 2009 NCAA Men's Basketball All-American by the United States Basketball Writers Association (USBW) and the National Association of Basketball Coaches (NABC) and was a third-team All America selection by the Associated Press and The Sporting News. On Monday, April 13, Collins announced that he would return to KU for his senior season.
 Links: a. United States Basketball Writers Association b. 2008–09 Big 12 Conference men's basketball season c. National Association of Basketball Coaches d. Oscar Robertson Trophy

Ex Output:
b


Ex Input:
Question: Who was the founder of the party that Ohlendorf joined in 1925? Passage:Born in Hoheneggelsen (today part of Söhlde; then in the Kingdom of Prussia), Otto Ohlendorf came into the world as part of "a farming family". He joined the Nazi Party in 1925 (member 6631) and the SS (member #880) in 1926. Ohlendorf studied economics and law at the University of Leipzig and the University of Göttingen, and by 1930 was already giving lectures at several economic institutions. He studied at the University of Pavia, where he gained his doctor's degree in jurisprudence; and by 1933 he obtained the position of a research directorship in the Kiel Institute for the World Economy. Ohlendorf was active in the National Socialist Students' League in both Kiel and Göttingen and taught at the Nazi Party's school in Berlin. He participated in major debates between the SS, the German Labour Front, and the Quadrenniel Organization on economic policy. By 1938 he was also manager in the Trade section of the Reich Business Board (). Historian quips that for Ohlendorf, Nazism was a "quest for race" in the historical continuum, and even though he never stated it that way, his faith in Germandom was akin to that of his fellow SS intellectuals.
 Links: a. Nazi Party b. Söhlde c. Schutzstaffel d. Nazi Party

Ex Output:

a