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: Which is the oldest ancient religious text that mentions Tripura? Passage:Although there is no evidence of lower or middle Paleolithic settlements in Tripura, Upper Paleolithic tools made of fossil wood have been found in the Haora and Khowai valleys. The Indian epic, the Mahabharata; ancient religious texts, the Puranas; and the Edicts of Ashoka – stone pillar inscriptions of the emperor Ashoka dating from the third century BCE – all mention Tripura. An ancient name of Tripura is Kirat Desh (English: "The land of Kirat"), probably referring to the Kirata Kingdoms or the more generic term Kirata. However, it is unclear whether the extent of modern Tripura is coterminous with Kirat Desh. The region was under the rule of the Twipra Kingdom for centuries, although when this dates from is not documented. The Rajmala, a chronicle of Tripuri kings which was first written in the 15th century, provides a list of 179 kings, from antiquity up to Krishna Kishore Manikya (1830–1850), but the reliability of the Rajmala has been doubted.
 Links: a. Puranas b. Haora River c. Upper Paleolithic d. Khowai River
Example Output: a

Example Input: Question: Who is the CEO of the airline that scheduled flights to several Florida cities and Detroit? Passage:In later years, Continental Express continued to serve the airport with nonstop regional jet flights to Cleveland while Continental Connection was operating nonstop turboprop flights to Albany, NY; however, both services ended in 2005. Spirit Airlines scheduled flights to several Florida cities and Detroit, before moving to LaGuardia Airport in 2001; in May 2008 the airline resumed service to Fort Lauderdale from MacArthur only to drop it soon after. Delta Express, which had nonstops to Orlando and Fort Lauderdale, dropped MacArthur Airport in 2003 after a decline in traffic. Delta Connection regional jet service to Atlanta flown by Atlantic Southeast Airlines (ASA) on behalf of Delta Air Lines ended on May 1, 2008 following a mid-April announcement that Delta and Northwest Airlines were planning to merge – a move that led to changes for the merged airline.
 Links: a. Detroit b. Atlanta c. Spirit Airlines d. Fort Lauderdale, Florida
Example Output: c

Example Input: Question: How long had Jack Palance been in the public eye the year Ripley's first premiered on NBC? Passage:Ripley's Believe It or Not! is the name of several documentary television series based on the newspaper feature. The first series aired on NBC from 1949 to 1950, and was hosted by Robert L. Ripley until his death, after which several substitute hosts filled in. The series was revived again on ABC, running from 1982-1986, and was hosted primarily by Jack Palance. Another revival debuted on TBS in 2000, and aired until 2003, with Dean Cain as the host. A Filipino version, hosted by Chris Tiu, debuted in 2008. An animated series based on the Ripley's franchise was also created, and premiered in 1999. Another revival premiered on Travel Channel in June 2019, with Bruce Campbell as the host.
 Links: a. NBC b. Bruce Campbell c. Jack Palance d. Travel Channel
Example Output:
c