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 old was Richard when Filip began working with him? Passage:He was the son of a merchant, Adolf Abraham Eisenberg, and Ester née Spiro. After finishing Sobieski Gymnasium in Kraków he studied medicine at the Jagiellonian University, where he obtained his PhD in medical studies in 1899. He then conducted postgraduate work in Vienna with Richard Paltauf and between 1901 and 1902 served as a research assistant to Odo Bujwid. Subsequently he worked in Paris, at the Pasteur Institute and then in Wrocław (Breslau) under the direction of Richard Pfeiffer. Between 1919 and 1920 he was the head of a Military Hospital in Warsaw. In 1933 he became the director of the National Bacteriology Station in Kraków, a position he held until 1939. Until 1941 he was the head of the Institute of Medical Microbiology in Lwów (L'viv).
 Links: a. Richard Paltauf b. Odo Bujwid c. Richard Friedrich Johannes Pfeiffer d. Odo Bujwid
Example Output: a

Example Input: Question: Of the two people who reached the finals on December 13th who has released the most albums? Passage:In October 2013, it was reported that Cowell may return to the UK version of The X Factor for series 11 in the place of Gary Barlow, and on 7 February 2014, his return was officially confirmed. This resulted in the cancellation of the US version after three seasons by Fox. He joined judges Louis Walsh, Cheryl Fernandez-Versini, and new judge, former Spice Girls member Mel B, who replaced Nicole Scherzinger. For his eighth series, he was given the Over 25s category. On 13 December, Ben Haenow and Fleur East reached the final two, which meant that Cowell was the winning mentor for the first time since series 3 in 2006, when he had both Leona Lewis and Ray Quinn in the final. Haenow became the eleventh winner on 14 December. In March 2015, it was announced that Cowell would return to the X Factor for its twelfth series along with veteran judge Cheryl Fernandez-Versini, and newcomers Rita Ora and BBC Radio 1 DJ Nick Grimshaw.
 Links: a. Ben Haenow b. Rita Ora c. Rita Ora d. Nick Grimshaw
Example Output: a

Example Input: Question: What is the birth date of the person who won the most votes in Searcy County in the 2016 presidential election? Passage:Along with adjacent Newton County, Searcy is unique among Arkansas counties in being traditionally Republican in political leanings even during the overwhelmingly Democratic "Solid South" era. This Republicanism resulted from their historical paucity of slaves, in turn created by infertile soils unsuitable for intensive cotton farming, and produced support for the Union during the Civil War. These were the only two counties in Arkansas to be won by Alf Landon in 1936, Wendell Willkie in 1940, Charles Evans Hughes in 1916, and even Calvin Coolidge in 1924. In Presidential elections post-1932, Harry S. Truman and Jimmy Carter are the only Democrats to carry the county. In the 1992 election George H. W. Bush won his second-highest margin in the state, and the Republican nominee has received over 60 percent in Presidential elections from 2000 to 2012 inclusive. In 2016, Searcy County voted over 79 percent for Donald Trump, while former Arkansas First Lady Hillary Clinton received just 16 percent.
 Links: a. Donald Trump b. Jimmy Carter c. George H. W. Bush d. Alf Landon
Example Output:
a