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: What current countries were part of the Ottoman Empire? Passage:Crimea: The Last Crusade is a panoramic history of the Crimean War of 1853–56. Drawing extensively from Russian, French and Ottoman as well as British archives, it combines military, diplomatic, political and cultural history, examining how the war left a lasting mark on the national consciousness of Britain, France, Russia and Turkey. Figes sets the war in the context of the Eastern Question, the diplomatic and political problems caused by the decay of the Ottoman Empire. In particular, he emphasises the importance of the religious struggle between Russia as the defender of the Orthodox and France as the protector of the Catholics in the Ottoman Empire. He frames the war within a longer history of religious conflict between Christians and Muslims in the Balkans, southern Russia and the Caucasus that continues to this day. Figes stresses the religious motive of the Tsar Nicholas I in his bold decision to go to war, arguing that Nicholas was swayed by the ideas of the Pan-Slavs to invade Moldavia and Wallachia and encourage Slav revolts against the Ottomans, despite his earlier adherence to the Legitimist principles of the Holy Alliance. He also shows how France and Britain were drawn into the war by popular ideas of Russophobia that swept across Europe in the wake of the Revolutions of 1830 and 1848. As one reviewer wrote, Figes shows "how the cold war of the Soviet era froze over fundamental fault lines that had opened up in the 19th century."
 Links: a. Crimean War b. Ottoman Empire c. Catholic Church d. Pan-Slavism
Example Output: b

Example Input: Question: Which team won the NHL's championship trophy the year after Smith's team achieved the feat in 1970? Passage:Smith was originally drafted by the Boston Bruins in the second round (7th overall) in the 1966 NHL Amateur Draft. He played in Boston from 1968–69 to 1971–72. Boston traded him in 1972 to the California Golden Seals of the NHL. He played there until the end of the next season (1972–73) when he left the NHL for the World Hockey Association (WHA) and played for the Minnesota Fighting Saints. In 1975–76 Smith returned to the NHL to play for the St. Louis Blues. He would remain with the Blues until the 1976–77 NHL season when he returned to the Boston Bruins. In 1980 Rick Smith would leave Boston to play one more NHL season split between the Detroit Red Wings (11 games) and the Washington Capitals (40 games). He won the Stanley Cup with the Boston Bruins in 1970. Rick Smith was a steady defenseman, not a scorer but a reliable part of talented teams. An important part of winning Bruin teams who worked hard in every game he participated in.
 Links: a. 1968–69 NHL season b. Detroit Red Wings c. 1971–72 NHL season d. Boston Bruins
Example Output: d

Example Input: Question: What music group produced the 2000's album that the UCSD Guardian described as "experimental"? Passage:Critical reaction to "The Gift That Keeps Giving" was generally positive with the New Musical Express rating it as one of the best on parent album Hey Venus!; "[it doesn't so much raise] the bar, as balances it on top of Mount Snowdon" going on to state: "From a foundation of ELO guitar cloud-swells, Gruff's Elvis Costello-in-a-bubblegum-bath voice wraps around tender trombone parps to create the band's most beautiful moment since "Demons". BBC Wales commented on the track's Christmas links, describing "The Gift That Keeps Giving" as a "mellow, mellifluous, slow ode to the joys of the festive season ... lyrically incredibly simple ... brain-bendingly catchy". The Guardian meanwhile, stated that the song "might sound more California than Christmas" but still possesses the "obligatory sleighbells ... shaken throughout". Much was made of the 'retro' nature of the track with Yahoo Music UK claiming that the song is "a pure blue-eyed soul tune, of the sort that Dan Penn and Spooner Oldham used to churn out four decades ago" and The Guardian describing it as a "gorgeous, Bacharach-tinged haze". In contrast the UCSD Guardian described "The Gift That Keeps Giving" as "jazzy" and "lo-fi" and saw it as "a throw-back to 2000's experimental Mwng".
 Links: a. Mwng b. Hey Venus! c. Electric Light Orchestra d. Mwng
Example Output:
a