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: Which of the seas that the Sibiryakov sailed to was larger? Passage:A. Sibiryakov sailed on 28 June 1932 from the Krasny (previously Sobornoy) docks in Arkhangelsk, crossed the Kara Sea and chose a northern, unexplored way around Severnaya Zemlya to the Laptev Sea. In September, after calling at Tiksi and the mouth of the Kolyma, the propeller shaft broke and the icebreaker drifted for 11 days. However, A. Sibiryakov crossed the Chukchi Sea using improvised sails and arrived in the Bering Strait in October. A. Sibiryakov reached the Japanese port of Yokohama after 65 days, having covered more than in the Arctic seas. This was regarded as a heroic feat of Soviet polar seamen and Chief of Expedition Otto Schmidt and Captain Vladimir Voronin were received with many honors at their return to Russia.
Links: a. Arkhangelsk b. Tiksi c. Kara Sea d. Kolyma
Example Output: c

Example Input: Question: Which team in the CIFL Championship Game had a better regular season record when Sheehan led his team to victory? Passage:Tyler Allen Sheehan is a former American football quarterback. Sheehan played collegiately at Bowling Green State University after a standout career at La Salle High School in Cincinnati, Ohio. After going undrafted in the 2010 NFL Draft, he signed with Houston Texans, where he was released after training camp. In 2011, he signed with the Cincinnati Commandos of the Continental Indoor Football League. Sheehan led the Commandos to a perfect 10-0 regular season, winning the league's MVP award. In the playoffs, Sheehan led the Commandos to the 2011 CIFL Championship Game, where they defeated the Marion Blue Racers 44-29. After the Commandos season ended, Sheehan signed with the Arizona Rattlers of the Arena Football League, but never appeared in a game. In 2012, Sheehan returned to the Commandos and led them to a 7-2 record, this time in the United Indoor Football League. The Commandos took the first place seed into the playoffs, and won Ultimate Bowl II 62-44 over the Florida Tarpons.
Links: a. CIFL Championship Game b. Cincinnati Commandos c. Florida Tarpons d. La Salle High School (Cincinnati, Ohio)
Example Output: b

Example Input: Question: What is the person Heinrich Sproemberg went to live with following his fathers death famous for? Passage:Following his father's relatively early death Heinrich Sproemberg went to live with his grandfather. It was now that he decided to concentrate his further academic studies on history. He attended the "Empress Augusta [secondary] school" ("Kaiserin-Augusta-Gymnasium" - as the "Ludwig-Cauer-Grundschule" was then known), and passed his school final exams ("Abitur") in 1909 which opened the way to a university education. He moved on to the Frederick William University (as the Humboldt was then known) where he studied History, and Jurisprudence. His teachers included , Michael Tangl and Otto Hintze. For his subsidiary module on Applied Economics he was taught by Gustav Schmoller. He received his doctorate in 1914 for work on the eleventh century Bishopric of Liege. The work was supervised by . However, after war broke out at the end of July 1914 there was a major falling out with Schafer. The German High Command implemented war plans that included a rapid invasion of Belgium which was accompanied by persistent reports of widescale atrocities by German troops against Belgian civilians. Sproemberg was at pains to distance himself from Schafer's "annexationist" support for German policy in respect of Belgium.
Links: a. Otto Hintze b. Heinrich Dernburg c. Oberste Heeresleitung d. Abitur
Example Output:
b