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: What version of iOS was current the year Bejeweled 2 was released on the platform? Passage:Bejeweled 2 is a tile-matching puzzle video game. The sequel to Bejeweled, it was developed and published by PopCap Games. In 2004, Bejeweled 2 Deluxe was released, which includes extra game modes and features. Bejeweled 2 Deluxe was released for the Xbox 360 as a downloadable Xbox Live Arcade game on November 22, 2005. In 2007, the game was released on the PlayStation 2 alongside another PopCap game, AstroPop as a two-game compilation pack as PopCap Hits! Volume 1. PopCap also released a version for iOS in 2008. Bejeweled 2 was also released for PlayStation 3 on the PlayStation Network on January 29, 2009, on the Wii via WiiWare on June 14, 2010, and on PlayStation Portable on June 29, 2010, and for Android. As with the original Bejeweled, Bejeweled 2 is based on the Shariki game mechanic.
Links: a. Xbox Live Arcade b. Shariki c. Ios d. PlayStation 3

Ex Output:
c

Ex Input:
Question: In what African country did Italy see a collapse in 1942? Passage:At the beginning of 1943, Italy was facing defeat. The collapse of the African front on 4 November 1942 and the Allied landings in North Africa on 812 November exposed Italy to an invasion of the Allied forces. The defeat of the Italian expeditionary force (ARMIR) in Russia, the heavy bombings of the cities, and the lack of food and fuel demoralized the population, the majority of whom wanted to end the war and denounce the alliance with Germany. Italy needed German aid in order to maintain control of Tunisia, the last stronghold of the Axis powers in Africa. Italy's Duce, Benito Mussolini, was persuaded that the war could be decided in the Mediterranean theater. On 29 April 1943, at the meeting in Klessheim, Hitler rejected Mussolini's proposition to seek a separate peace with Russia and move the bulk of the German Army south. The request for reinforcements to defend the bridgehead in Tunisia was refused by the Wehrmacht, which no longer trusted the Italian will to maintain resistance. Mussolini's health was another main factor of uncertainty. He was depressed and sick after being diagnosed with gastritis and duodenitis of a nervous origin. Because of his illness, the Duce was often forced to stay at home, depriving Italy of effective government.
Links: a. Second Battle of El Alamein b. Gastritis c. Axis powers d. Italian Army in Russia

Ex Output:
a

Ex Input:
Question: What war were the boats like Kennedy was on used in? Passage:Within weeks, many Americans could recite favorite lines from the record, including "the rubber schwan [swan] is mine", and "move ahead...with great vigah [vigor]", the latter lampooning the President's own words. The album poked fun at Kennedy's PT-109 history; the rocking chairs he used for his painful back; the Kennedy clan's well-known athleticism, football games and family togetherness; children in the White House; and Jackie Kennedy's soft-spoken nature and her redecoration of the White House; and many other bits of knowledge that the public was eager to consume. Kennedy himself was said to have given copies of the albums as Christmas gifts, and once greeted a Democratic National Committee group by saying, "Vaughn Meader was busy tonight, so I came myself." According to UPI reporter Merriman Smith, during a Cabinet meeting Kennedy played the entire record for everyone. At one press conference, Kennedy was asked if the album had produced "annoyment (sic) or enjoyment." He jokingly responded, "I listened to Mr. Meader's record and, frankly, I thought it sounded more like Teddy than it did me. So, now he's annoyed."
Links: a. American football b. Patrol torpedo boat PT-109 c. Democratic National Committee d. Ted Kennedy

Ex Output:
b