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: Who was older when Heitler obtained his doctorate, Arnold Sommerfeld or Karl Herzfeld? Passage:In 1922, Heitler began his study of physics at the Karlsruhe Technische Hochschule, in 1923 at the Humboldt University of Berlin, and in 1924 at the Ludwig Maximilian University of Munich (LMU), where he studied under both Arnold Sommerfeld and Karl Herzfeld. The latter was his thesis advisor when he obtained his doctorate in 1926; Herzfeld taught courses in theoretical physics and one in physical chemistry, and in Sommerfeld's absence often took over his classes. From 1926 to 1927, he was a Rockefeller Foundation Fellow for postgraduate research with Niels Bohr at the Institute for Theoretical Physics at the University of Copenhagen and with Erwin Schrödinger at the University of Zurich. He then became an assistant to Max Born at the Institute for Theoretical Physics at the University of Göttingen. Heitler completed his Habilitation, under Born, in 1929, and then remained as a Privatdozent until 1933. In that year, he was let go by the university because he was Jewish.
 Links: a. University of Göttingen b. Ludwig Maximilian University of Munich c. Arnold Sommerfeld d. Arnold Sommerfeld

Output: c


Input: Consider Input: Question: What was the final score in the loss to the Houston Rockets on March 30? Passage:On December 8, 2017, the Phoenix Suns signed House to a two-way contract with the team. Throughout the rest of the season, House would split his playing time there between Phoenix and their NBA G League squad, the Northern Arizona Suns. House would make his debut with the team a day later, scoring two points and recording a single rebound in 11 minutes of play in a close loss against the San Antonio Spurs. On December 16, House would score a season-high 8 points in 15 minutes of playing time in a 108–106 win over the Minnesota Timberwolves. House was later assigned to the Northern Arizona Suns affiliate alongside Davon Reed on December 28, mainly for healing purposes. House then returned to action on January 5, 2018, recording what was at the time a new season-high 9 points in a loss against the San Antonio Spurs. On February 23, his two-way contract expired, meaning he couldn't be allowed to play for Phoenix again until after the NBA G League's first season under its rebranded name concluded. Once that happened, he was allowed to return to Phoenix for the rest of the season. On March 30, House recorded a career-high 8 rebounds in a heartbreaking, buzzer-beating loss against the Houston Rockets. On April 1, House would record a new season-high with 16 points scored alongside 6 rebounds and 3 assists in a 117–107 loss against the Golden State Warriors. Two days later, House recorded 14 points, 6 rebounds, and a career-high 5 assists in a 97–94 win against the Sacramento Kings. On April 6, House would put up his first start in the NBA against the New Orleans Pelicans. Two days later, House would record career-highs of 22 points and 8 rebounds in a 117–100 loss to the Golden State Warriors.
 Links: a. NBA G League b. Houston Rockets c. Golden State Warriors d. Northern Arizona Suns

Output: b


Input: Consider Input: Question: What country was the creator of "Colonel Jonathan the Saint" born in? Passage:In 1963-1964 Walker was a resident artist at the Oldenburgisches Staatstheater. He then became a resident artist at the Cologne Opera from 1964-1966. Other contracts soon followed with such companies as the Cincinnati Opera, the Houston Grand Opera, the Lyric Opera of Kansas City, the Miami Opera, and the New Orleans Opera among others. In 1971 he created the role of Jonathan Gilourin in the world premiere of Dominick Argento’s Colonel Jonathan the Saint at the Denver Lyric Opera. In 1974 he was handpicked by Sir Georg Solti to sing the role of the Evangelist in Bach's St Matthew Passion with the Chicago Symphony Orchestra (CSO). He returned twice more for performances with Solti and the CSO for performances of the Shepherd in Stravinsky's Oedipus Rex (1976) and Beethoven's Missa Solemnis (1977); the latter of which was recorded for London Records.
 Links: a. Missa solemnis b. Dominick Argento c. Houston Grand Opera d. Cologne Opera


Output: b