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 many years were there between the end of the British Burma Campaign and the start of the Battle of Na San? Passage:The First Indochina War had raged, as guerrilla warfare, since 19 December 1946. From 1949, it evolved into conventional warfare, due largely to aid from the communists of the People's Republic of China ("PRC") to the north. Subsequently, the French strategy of occupying small, poorly defended outposts throughout Indochina, particularly along the Vietnamese-Chinese border, started failing. Thanks to the terrain, popular support for August Revolution and support for decolonization from bordering China and the U.S.S.R., the Viet Minh had succeeded in turning a "clandestine guerrilla movement into a powerful conventional army", following asymmetric warfare theory laid by Mao Tse Tung, something which previously had never been encountered by the western colonial powers. In October 1952, fighting around the Red River Delta spread into the Thai Highlands, resulting in the Battle of Nà Sản, at which the Viet Minh were defeated. The French used the lessons learned at Nà Sản – strong ground bases, versatile air support, and a model based on the British Burma Campaign – as the basis for their new strategy. The Viet Minh, however, remained unbeatable in the highland regions of Vietnam, and the French "could not offset the fundamental disadvantages of a roadbound army facing a hill and forest army in a country which had few roads but a great many hills and forests".
 Links: a. China b. On Guerrilla Warfare c. Battle of Nà Sản d. China

Ex Output:
c


Ex Input:
Question: Did the Phillies win the league championship the year that Roberts won 20 games? Passage:Of those Phillies, 97 have had surnames beginning with the letter R. Two of those players have been inducted into the Baseball Hall of Fame: pitcher Eppa Rixey, who was a Phillie for six seasons in two different stints (1912–1917, 1919); and Robin Roberts, who won 20 games during the 1950 season as the ace pitcher of the Whiz Kids. The Hall of Fame lists the Phillies as Roberts' primary team; during his career, the right-hander won 234 games and lost 199, the latter one of his three franchise records. During his 14 seasons with the team, he pitched 3,739  innings and completed 272 games, both records; he also held the major league record for most career home runs allowed until it was broken in 2010. Roberts was also elected to the Philadelphia Baseball Wall of Fame as the Phillies' first inductee in 1978.
 Links: a. 1950 Philadelphia Phillies season b. 1950 Philadelphia Phillies season c. Win–loss record (pitching) d. R

Ex Output:
a


Ex Input:
Question: How old was the person who replaced Himmatsinhji in 1954 when Himmatsinhji died? Passage:After a brief period in the diplomatic service, Himmatsinhji returned to the army, seeing service in the Second World War. A war-substantive lieutenant-colonel at the war's end, he eventually reached the rank of major-general. He was appointed a Companion of the Order of the Indian Empire (CIE) in the 1946 New Year Honours. He was elected to the Central Legislative Assembly, India's pre-independence lower house, in 1946, and was later a member of the Constituent Assembly, the transitional body established after independence. A member of the Indian National Congress, he was a party whip before being appointed Deputy Minister of Defence in Jawaharlal Nehru's first ministry. In this position he chaired a committee responsible for recommended improvements to India's defences along its border with what was then the Kingdom of Tibet, prior to China's invasion and eventually annexation. Upon retirement, Himmatsinhji was appointed the first lieutenant-governor of Himachal Pradesh, a newly created Part C state of India. He served in the position from 1952 to 1954, when he was succeeded by Bajrang Bahadur Singh. Himmatsinhji died in January 1973.
 Links: a. Indian Foreign Service b. Bajrang Bahadur Singh c. Whip (politics) d. Bajrang Bahadur Singh

Ex Output:

b