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 old was the commander in chief when he coordinated a massive anti-guerrilla operation? Passage:In 1970, 22-year-old Crespo had dropped out of IST and was eventually drafted into military service in the Portuguese Colonial War. He transferred to Mozambique where his military occupation was to check the cement cargoes from Beira to the Cahora Bassa Dam construction site, near Tete. Some time later, due to his good fluency in English, he was placed in the press office of Kaulza de Arriaga, the commander in chief of the Portuguese Armed Forces in Mozambique, who had coordinated a massive anti-guerrilla operation against FRELIMO separatists in 1970 - the Gordian Knot Operation. While serving in the army, Crespo also entered the newly created School of Medicine of the University of Lourenco Marques where he would complete a number of academic disciplines but did not graduate. He also married Helen de Souza from Johannesburg, a South African woman with Portuguese ancestry who worked in genetics. After the Carnation Revolution left-leaning military coup at Lisbon in April 1974, fresh out of the troop, Crespo fled Mozambique for South Africa.
Links: a. Portuguese Colonial War b. Tete, Mozambique c. Kaulza de Arriaga d. Kaulza de Arriaga

Output: c

Input: Consider Input: Question: When was the facility where Bill Clinton and his Vice-President had lunch after a ceremony on the banks of the scenic New River built? Passage:Ashe County has been home to, produced, or been visited by, several prominent people. It is the hometown of Monte Weaver from Helton who pitched for the Washington Senators and pitched a World Series game in 1933. After being traded from the Senators, he pitched for the Boston Red Sox, before being called into service in World War II. Weaver died in 1994. Albert Hash a well-known and beloved fiddler and instrument maker at one time resided in Lansing. Helen Keller visited an Ashe County native, Marvin Osborne, in 1944 when he was wounded in France in World War II. Loretta Lynn sang at the Central Food Market in West Jefferson in the late 1960s (the Central Food building formally housed a locally owned auto parts store and is now the location of a local restaurant). Roni Stoneman was a visitor to Ashe Park in the 1980s. In 1998, then-President Bill Clinton and his Vice-President, Al Gore, held a ceremony on the banks of the scenic New River to designate it as an American Heritage River. After the ceremony, both men had lunch at the historic Glendale Springs Inn, also located in Ashe County. Fiddle player G. B. Grayson was born in Ashe County in 1887.
Links: a. World Series b. Glendale Springs Inn c. American Heritage Rivers d. Helen Keller

Output: b

Input: Consider Input: Question: What were the names of the parents of the musician Bolland particularly embraced? Passage:Growing up as "and only child in a house without culture," (Bolland says that his "mother and father had no use for art, literature or music"), he embraced the late 1960s pop culture explosion of "pirate radio stations, music (particularly Frank Zappa...), drug taking, psychedelia, "peace and love," "dropping out," the underground scene, Oz Magazine," and other aspects of hippy culture epitomised by underground comix such as Robert Crumb's Zap Comix. Having taken both O-Level and A-Level examinations in art, Bolland spent five years at art school (starting in 1969) learning graphic design and Art history. Learning to draw comics, however, was "more a self-taught thing," with Bolland eventually writing a 15,000-word dissertation in 1973 on Neal Adams an "artist [his teachers] had never heard of." He would later recall:
Links: a. Neal Adams b. Graphic design c. Zap Comix d. Frank Zappa
Output: d