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: How many members did No. 11 Group have during the years of the Blitz? Passage: the Second World War, the station was very active during the Battle of Britain and the Blitz in 1940–41 in No. 12 Group (controlled from RAF Watnall in Nottingham) as it was the main fighter station for a lot of the southern East Midlands, and fighters from the station would often patrol as far as Birmingham. During the Battle of Britain many squadrons were rotated through Wittering to spells in the south of England with No. 11 Group that was bearing the brunt of the battle. With many of the Luftwaffe raids during the Blitz taking part at night, Wittering-based squadrons were instrumental in the development of night combat techniques. These included the use of the Turbinlite aircraft which replaced the nose with a powerful searchlight insulated in the nose of Havocs and Bostons. In April 1943 No. 141 Squadron were moved in, operating de Havilland Mosquitoes. 1943 also saw the station host 2 USAAF squadrons, albeit temporarily: 63 Fighter Squadron USAAF with its P47s operated from Wittering between January and March before moving to RAF Horsham St Faith; 55 Fighter Squadron operated its P38s and P51s from Wittering between August and March 1944 before moving to nearby RAF Kingscliffe.
 Links: a. No. 11 Group RAF b. Birmingham c. Birmingham d. 63rd Fighter Squadron
Example Output: a

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: What is the capacity of the venue where Threlfall made his first-class debut against Somerset? Passage:Threfall played for Cumberland in 1987, making a single appearance in the Minor Counties Championship against Cambridgeshire and a single appearance in the MCCA Knockout Trophy against Cheshire. In 1988, Threfall played Second XI cricket for Sussex, with him also making his first-class debut for the county in that season against Somerset at the Recreation Ground, Bath. He played regularly for the Sussex Second XI, but would only make two further first-class appearances for the county, against the touring Sri Lankans in 1990 and Cambridge University in 1991. He never batted in his three first-class appearances, but with the ball he took 7 wickets at an average of 18.57, with best figures of 3/45. He also made a single List A appearance for the county against the touring Zimbabweans in 1990. He ended Sussex's innings of 233/8 unbeaten on 17, while in the Zimbabweans innings he took figures of 3/40 from 10 overs, with Sussex winning by 95 runs. He continued to play for the Sussex Second XI until 1994.
 Links: a. Somerset County Cricket Club b. Cambridge University Cricket Club c. Recreation Ground (Bath) d. Bowling average
Example Output:
c