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 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: How old was the person George studied with at University of Michigan when George attended Muhlenberg College? Passage:At age 17 Miller began school-teaching to raise funds for higher education. In 1882 he entered Franklin and Marshall Academy, and progressed to Muhlenberg College in 1884. He received his B.A. in 1887 and M.A. in 1890. While a graduate student, Miller was Principal of schools in Greeley, Kansas and then professor of mathematics as Eureka College in Eureka, Illinois. He corresponded with Cumberland University in Lebanon, Tennessee for his Ph.D. in 1892. He then joined Frank Nelson Cole at University of Michigan and began to study groups. In 1895 he went to Europe where he heard Sophus Lie lecture at Leipzig and Camille Jordan at Paris. In 1897 he went to Cornell University as an assistant professor, and in 1901 to Stanford University as associate professor. In 1906 he went to University of Illinois where he taught until retirement in 1931.
Links: a. Cumberland University b. Frank Nelson Cole c. Frank Nelson Cole d. Frank Nelson Cole
Example Output: b

Example Input: Question: Which band that Yokam released cover songs from has more members, The Clash or Queen? Passage:Johnny Cash once cited Yoakam as his favorite country singer. Chris Isaak called him as good a songwriter as ever put a pen to paper. Time dubbed him "A Renaissance Man" and Vanity Fair declared that "Yoakam strides the divide between rock's lust and country's lament." Along with his bluegrass and honky-tonk roots, he has written or covered many Elvis Presley-style rockabilly songs, including his covers of Queen's "Crazy Little Thing Called Love" in 1999 and Presley's "Suspicious Minds" in 1992. He recorded a cover of The Clash's "Train in Vain" in 1997, a cover of the Grateful Dead song "Truckin'", as well as Cheap Trick's "I Want You to Want Me". He has never been associated only with country music; on many early tours, he played with hardcore punk bands like Husker Du, and played many shows around Los Angeles with roots/punk/rock & roll acts. His middle-period-to-later records saw him branching out to different styles, covering rock & roll, punk, 1960's, blues-based "boogie" like ZZ Top, and writing more adventurous songs like "A Thousand Miles From Nowhere". In 2003, he provided background vocals on Warren Zevon's last album The Wind.
Links: a. Queen (band) b. Suspicious Minds c. Warren Zevon d. Train in Vain
Example Output:
a