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: Is the team that Duke City lost to in the 2007 WFTDA WEstern Regional Tournament quarterfinals still active? Passage:Duke City's all-star travel team, the Mueñcas Muertas, represented the league at the first WFTDA Championships in 2006, where they finished 19th out of 20 teams. At the 2007 WFTDA Western Regional Tournament Duke City won their opening game 110-82 over the Rocky Mountain Rollergirls, but then lost to Tucson Roller Derby in the quarterfinals, 166-41. At the 2008 Western Regional, Duke City opened with a victory over Pikes Peak Derby Dames and then upset the defending WFTDA Champion Kansas City Roller Warriors 132-117, automatically qualifying for Championships. Duke City then lost to Bay Area in the semifinals and Rat City Rollergirls in the third place game to finish Westerns in fourth place. At Championships in Portland, Duke City lost their opening round game to Gotham Girls Roller Derby 182-25. At the 2009 Western Regional, Duke City lost the fifth place game to Bay Area 105-103 to finish in sixth place. As the eighth seed at the 2009 Western Playoff, Duke City lost their opening games to Tucson and Denver, before falling to Sacred City Derby Girls to finish in tenth place.
 Links: a. Tucson Roller Derby b. Denver Roller Derby c. WFTDA Western Regional Tournament d. Sacramento Roller Derby

Ex Output:
a


Ex Input:
Question: Who other than Woldenga has been awarded the Knights cross of the Iron Cross? Passage:Woldenga's career started as a captain in the merchant marine. He started his flight training in 1928 and worked as chief pilot for the FVK Warnemünde. He transferred to the newly emerging Luftwaffe, taking command as Gruppenkommandeur of the I./Jagdgeschwader 131 (JG 131) — later renamed to I./Jagdgeschwader 1 (JG 1) — on 1 April 1937. With this unit he participated in the invasion of Poland in 1939. He surrender command of the Gruppe on 1 February 1940 and was transferred to the Reichsluftfahrtministerium. He briefly led Jagdgeschwader 27 (JG 27) on the Channel Front from 11 October to 22 October 1940 before he was made Geschwaderkommodore of Jagdgeschwader 77 (JG 77). Under this command, JG 77 participated in the Balkans Campaign and invasion of Crete. JG 77 claimed 50 aerial victories. Woldenga received the Knight's Cross of the Iron Cross. He commanded of JG 27 on 21 June 1941 during the invasion of the Soviet Union and claimed 4 aerial victories. He relocated the Geschwaderstab to North Africa in December 1941. He was appointed Fliegerführer Balkan on 10 June 1942. His last service position of the war was commander of the Luftkriegschule 10 in Fürstenwalde near Berlin. He is credited with three aerial victories of which two were claimed on the Eastern Front.
 Links: a. Knight's Cross of the Iron Cross b. Fürstenwalde c. Fürstenwalde d. Jagdgeschwader 77

Ex Output:
a


Ex Input:
Question: When was the bureau established that   Lt. Vreeland was assigned after a three-year tour at sea aboard the sloop-of-war  Passage:Vreeland was further promoted to master and then lieutenant after successive tours of duty on board the screw steamer , the gunboat and the sloop-of-war . He was then assigned to the Nautical Almanac Office of the US Naval Observatory in November 1881 after a brief period ashore awaiting orders. In March 1884, Lt. Vreeland began a three-year tour at sea aboard the sloop-of-war , after which he was assigned for two years at the Bureau of Navigation. He was then assigned briefly (from July to September 1889) with the Office of Naval Intelligence and reported to the Coast Survey late in October, a posting he took until the spring of 1893, when Vreeland was assigned a series of tours as naval attaché — first in Rome, Vienna and finally in Berlin.
 Links: a. Berlin b. Bureau of Navigation (United States Navy) c. Gunboat d. Office of Naval Intelligence

Ex Output:

b