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.

Ex 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 Kaúlza 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 Lourenço 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. Kaúlza de Arriaga d. Kaúlza de Arriaga

Ex Output:
c


Ex Input:
Question: Which is the oldest city that borders Garden Grove? Passage:West Grove, officially recognized as the West Grove Business District by the City of Garden Grove, and sometimes called West Garden Grove, is a neighborhood in the city of Garden Grove, located in Orange County, California, United States. West Grove encompasses the pene-exclave western portion of the city of Garden Grove. It is bordered to the north by Cypress, to the west by Los Alamitos and Seal Beach, to the south by Westminster, and to the east by Stanton, and connected to the rest of Garden Grove by a narrow strip along Garden Grove Boulevard. It includes the entire 92845 ZIP Code, which is designated as the areas west of Knott Avenue to the Seal Beach and Los Alamitos city borders, and the industrial area east of Knott Avenue to the Stanton border. The community is more "affluent" than the rest of Garden Grove, with a median income $25,000 greater than the main body of the city. There is also less crime, a lower poverty rate, and the population density is lower compared to the rest of Garden Grove. As of the 2010 Census, 16,333 people reside in West Grove.
 Links: a. Orange County, California b. Cypress, California c. Garden Grove, California d. Garden Grove, California

Ex Output:
b


Ex Input:
Question: Did the city he got started in radio at, or the one he moved to subsequently, have a larger population at the time? Passage:Don Bleu (real name Rick Kelleher) is an American retired radio personality and former television host. He grew up in East Grand Forks, Minnesota and began his career in 1966, when his friend Shadoe Stevens encouraged him to try radio. He started at KILO (defunct) in Grand Forks, North Dakota, then moved to KQWB in Fargo, North Dakota. He then moved to the Minneapolis-St. Paul area in 1968 and worked at KDWB for nearly 10 years. His success at KDWB earned him a job at KHJ (AM) in Los Angeles. In 1980, he moved to San Francisco and worked in the adult contemporary radio genre. Most recently, he hosted the Don Bleu Show on KOSF, a music station in San Francisco, California. He was named to the Pavek Museum of Broadcasting's Minnesota Broadcasting Hall of Fame in 2005, and in 2007 he was inducted into the Bay Area Radio Hall of Fame. Bleu initially worked at KIOI until 2011, when he moved to KOSF. He was let go from the latter station and did his last broadcast on June 26, 2015.
 Links: a. Los Angeles b. Grand Forks, North Dakota c. California Historical Radio Society d. East Grand Forks, Minnesota

Ex Output:

b