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: For how many years did the man serve as President that swept all five boroughs of NYC in 1964? Passage:Roosevelt won his home state by means of a dominance of the massively populated New York City area, performing even more strongly than he had in 1932. Roosevelt took over seventy percent of the vote in the boroughs of Manhattan, Brooklyn, and the Bronx, and took over sixty percent of the vote in Queens and Staten Island. For the era, this was an historically overwhelming victory for a Democratic presidential candidate in the five boroughs of New York City, and enough to easily secure a statewide win for Roosevelt. The emergence of the New Deal Coalition was at its peak in 1936, and made American cities with their powerful political machines core bases of support for the Democratic Party. The Great Depression had accelerated the process of urbanization of the Democratic Party which had begun with the election of 1928. Roosevelt’s landslide win in New York City was a fruit born by this process, and over the whole nation he achieved majorities in the largest cities totalling twice what Harding had achieved in 1920. 1936 was the third election in a row in which Democrats had won all five boroughs of NYC, following 1928 and 1932. After 1936, New York City would remain Democratic overall in every election that has followed, although no presidential candidate would sweep all five boroughs of NYC again until Lyndon Johnson in 1964. Partly as a consequence of this, FDR’s 1936 victory in New York State would also be the strongest statewide Democratic performance ever in terms of both margin and vote share until 1964.
 Links: a. Lyndon B. Johnson b. 1964 United States presidential election in New York c. Manhattan d. 1928 United States presidential election
Example Output: a

Example Input: Question: What were the other three songs on the Woodchuck EP beside the promotional single? Passage:Formed in 2006, Go:Audio signed to Epic Records in May 2007. Their promotional single, Woodchuck, was released to many radio and music television stations in late January the following year to promote the 4-track Woodchuck EP. It received heavy rotation, most notably from Kerrang! 105.2 which helped make the accompanying music video one of the most played on YouTube in the United Kingdom that month. The band's first official single, "Made Up Stories" was released on 26 May 2008 and the video, in which a hand-picked group of fans participated, was frequently shown on Kerrang!, Scuzz and Fizz TV (now known as Starz TV). Following the single's release the band announce via their MySpace page that their debut album would carry the same title. Recording for the album took place in Sussex, England and was completed by early June 2008 for a 25 August release. The album was leaked in late June 2008, and a decision was made to delay the release date until 19 January 2009. The second single from Made Up Stories was "She Left Me", released on August 11, the first day of their UK headline tour. The band debuted an acoustic version of the track on 6 August on Rocklouder.co.uk. "She Left Me" just missed on reaching the UK Top 40, peaking at No. 41.
 Links: a. Scuzz b. The Woodchuck EP c. Scuzz d. She Left Me
Example Output: b

Example Input: Question: What country is the National Institute of Health located in? Passage:While working at the National Institute of Health, Lisziewicz worked to find a gene therapy approach to treat HIV/AIDS. She based her research on discovering if small portions of gene-stopping DNA (called antisense oligonucleotides) could be created to bind up the viral RNA in retroviruses like HIV so that the virus could not make more copies of itself to continue the infection. Small pieces of messenger RNA (or mRNA) carry a copy of the cell's DNA to the ribosomes where the mRNA directs the ribosomes to create the proteins that the cells need. Viruses (like HIV) have their own set of mRNA, and they use the ribosomes of the cell they infected to make new viruses to propagate the infection throughout the body. Lisziewicz's idea was to create antisense oligonucleotides that are complementary to the HIV's viral mRNA. These complementary DNA pieces can bind to the HIV viral mRNA and prevent the HIV virus from replicating itself. The use of antisense oligonucleotides worked very well in cell cultures, and was quickly transferred to clinical trials.
 Links: a. National Institutes of Health b. HIV/AIDS c. National Institutes of Health d. Gene therapy
Example Output:
a