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 people live in the city where Kirdorf was born? Passage:Emil Kirdorf was born at Mettmann, Rhine Province. His father was a wealthy owner of a weaving mill. He had a brother named Adolf who would be his business partner during his adult life. Kirdorf volunteered a year in 1864 in Hamburg to work in an export enterprise. A year later, he worked in a textile company in Krefeld. The family's mill went bankrupt, mainly because of the management's refusal to introduce mechanical looms. Kirdorf therefore changed to mining industry in which he worked as an accountant. Following the Franco-Prussian War, he became director of Zeche Holland in 1871. Two years later, the entrepreneur Friedrich Grillo offered him the position of commercial director in the Gelsenkirchener Bergwerks-AG (GBAG) company. He became general manager of GBAG in 1893. He steered the company through the Long Depression of the 1870s, and held this position until 1926.
 Links: a. Friedrich Grillo b. Management c. Mettmann d. Mettmann

Output: c


Input: Consider Input: Question: Between the bass player and the founding drummer of Kajagoogoo, who has more siblings? Passage:Islands is the second album by the British pop band Kajagoogoo, released on 21 May 1984 on the EMI label. This was the band's first album without lead vocalist Limahl, who had been fired by the band in mid-1983 and went on to pursue a solo career. Bass player Nick Beggs, already the group's main backing singer, took over lead vocal duties, and also wrote the lyrics. The album was co-produced by the band themselves, now a four-piece group, along with Colin Thurston, who had also produced their debut, White Feathers. It is the final album to-date to feature founding drummer Jez Strode. The album also marked the first time Nick Beggs used the Chapman Stick on a recording.
 Links: a. Nick Beggs b. Lyrics c. United Kingdom d. Kajagoogoo

Output: a


Input: Consider Input: Question: What was the name of Lukas' mother? Passage:Thomas Christian David (December 22, 1925 – January 19, 2006) was an Austrian composer, conductor, choral conductor, and flutist. David was born in Wels, Upper Austria in 1925. He moved to Germany in 1934 at the age of nine with his father, composer Johann Nepomuk David, and mother. Thomas's younger brother, Lukas David, (born 1934) later became a violinist. In 1967, at the age of forty-two, he married (), a Persian Opera singer and they moved to Iran. David was the chief conductor of the orchestra of the National Iranian Television NITV, and also taught at the University of Tehran for seven years until 1973. He had an enormous and invaluable role in the growth and development of the Classical music in Iran. He conducted numerous masterpieces in different venues in Iran from late 1960s to late 1990s.
 Links: a. Johann Nepomuk David b. Johann Nepomuk David c. Germany d. Wels


Output: a