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.

Input: Consider Input: Question: How many President's children have lived in the White House? Passage:Within weeks, many Americans could recite favorite lines from the record, including "the rubber schwan [swan] is mine", and "move ahead...with great vigah [vigor]", the latter lampooning the President's own words. The album poked fun at Kennedy's PT-109 history; the rocking chairs he used for his painful back; the Kennedy clan's well-known athleticism, football games and family togetherness; children in the White House; and Jackie Kennedy's soft-spoken nature and her redecoration of the White House; and many other bits of knowledge that the public was eager to consume. Kennedy himself was said to have given copies of the albums as Christmas gifts, and once greeted a Democratic National Committee group by saying, "Vaughn Meader was busy tonight, so I came myself." According to UPI reporter Merriman Smith, during a Cabinet meeting Kennedy played the entire record for everyone. At one press conference, Kennedy was asked if the album had produced "annoyment (sic) or enjoyment." He jokingly responded, "I listened to Mr. Meader's record and, frankly, I thought it sounded more like Teddy than it did me. So, now he's annoyed."
 Links: a. Child b. Rocking chair c. Sport d. Ted Kennedy

Output: a


Input: Consider Input: Question: Which of Messner's teachers at the University of Munich was older? Passage:After Meissner’s abitur at the Humanistisches Gymnasium, in 1910, he began the study of physics and mathematics at University of Tübingen. After three terms, he went to the University of Munich as a student of the experimentalist Wilhelm Röntgen and the theoretician Arnold Sommerfeld. After one year at Munich, he returned to Tübingen to be able to study spectroscopy with Friedrich Paschen. While still a student in 1914, Meissner was able to prove the existence of oxygen lines in the solar spectrum. He was awarded his doctorate in 1915, on a thesis with the title Interferometrische Wellenlängenbestimmung im infraroten Spektralbereich. In 1916 he became an assistant to Edgar Meyer at the University of Zurich, under whom he completed his Habilitation, in 1918, with the Habilitationsschrift title Untersuchungen des Neonspektrums. The following year, he married the Polish physicist Doctor Janka Kohn.
 Links: a. Habilitation b. Ludwig Maximilian University of Munich c. University of Tübingen d. Wilhelm Röntgen

Output: d


Input: Consider Input: Question: What city did Madonna perform in on March 1, 2015? Passage:On March 1, 2015, Madonna performed the song for the first time on Italian TV show, Che tempo che fa, along with "Ghosttown", the album's second single. An episode featuring her appearance was aired on March 8. For the performance of "Devil Pray", Madonna wore "an extravagant black robe and various rosaries." A writer for Yahoo! noticed that both performances were warmly received by the audience, while Lionel Nicaise appreciated that Madonna put more emphasis on the melodies and her vocals during the performance, rather than costumes and stage props. Bianca Grace of Idolator noted that the performance "will have you repenting your weekend sins, as the singer emotionally sings the tune." "Devil Pray" was performed on Madonna's 2015–16 Rebel Heart Tour. Following the Last Supper-themed mashup performance of "Holy Water" and "Vogue", Madonna climbed down to the center stage to perform "Devil Pray"; during the performance she straddled one of her male dancers, who was dressed as a priest, and engaged in a dance-off with other dancers. Jordan Zivitz from the Montreal Gazette said that she found the performance to be "challenging". Previous to this the song was also used for promotional videos related to the tour's rehearsals and dancer interviews. The performance of "Devil Pray" at the March 19–20, 2016 shows in Sydney's Allphones Arena was recorded and released in Madonna's fifth live album, Rebel Heart Tour.
 Links: a. Che tempo che fa b. Mashup (music) c. Yahoo! d. Vogue (Madonna song)


Output: a