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: Where was the Jesuit priest who was hanged after the 1584 Act against Jesuits born? Passage:More than 300 Roman Catholics were put to death by English governments between 1535 and 1681 for treason, thus for secular rather than religious offenses. In 1570, Pope Pius V issued his papal bull Regnans in Excelsis, which absolved Catholics from their obligations to the government. This dramatically worsened the situation of the Catholics in England. English governments continued to fear the fictitious Popish Plot. The 1584 Parliament of England, declared in "An Act against Jesuits, seminary priests, and such other like disobedient persons" that the purpose of Jesuit missionaries who had come to Britain was "to stir up and move sedition, rebellion and open hostility". Consequently, Jesuit priests like Saint John Ogilvie were hanged. This somehow contrasts with the image of the Elizabethan era as the time of William Shakespeare, but compared to the antecedent Marian Persecutions there is an important difference to consider. Mary I of England had been motivated by a religious zeal to purge heresy from her land, and during her short reign from 1553 to 1558 about 290 Protestants had been burned at the stake for heresy, whereas Elizabeth I of England "acted out of fear for the security of her realm."
 Links: a. List of Protestant martyrs of the English Reformation b. John Ogilvie (saint) c. Treason d. John Ogilvie (saint)
Example Output: b

Example Input: Question: How many miles long is the river that Silvanus drove the Alamanni tribesmen back from? Passage:Silvanus was born in Gaul, the son of Bonitus, a Laetic Frankish general who had supported Constantine I in the civil war against Licinius. Like so many other Franks of his times, and like his father before him, he was a loyal and thoroughly romanized "barbarian" in the military service of the Empire. By AD 351, he held the rank of tribune and was one of the senior officers who defected to Emperor Constantius II at the Battle of Mursa Major, after initially supporting the usurper Magnentius. An able soldier, Silvanus was eventually promoted to the rank of Magister militum per Gallias, a crucial post, then in AD 352-353, Constantius personally entrusted him with the difficult task of driving the Alamanni tribesmen raiding and looting in Gaul back beyond the Rhine, and restoring the fast eroding Roman authority in the province. This Silvanus fulfilled partly by bribing the Alamanni chieftains with the taxes he had collected, partly by defeating the Alamanni in battle and partly by suppressing the local bagaudae insurrections flaring up again in central and northern Gaul.
 Links: a. Bonitus (magister militum) b. Constantine the Great c. Rhine d. Rhine
Example Output: c

Example Input: Question: What year was the album released which was the parent album of "The Gift That Keeps Giving"? 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. Hey Venus! b. Yahoo! c. Mwng d. UCSD Guardian
Example Output:
a