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: What is the oldest city that was chosen for filming Aeon Flux? Passage:The screenplay was written by Phil Hay and Matt Manfredi, and directed by Karyn Kusama. It was based on the animated TV series by Peter Chung, who had a minor role in this film version of his work. In the early stages of production, actress Michelle Rodriguez was considered for the part of Æon. She had previously worked with Kusama in Girlfight. Kusama had originally suggested filming in Brasília, the capital of Brazil, because the 20th-century modern architecture of that city fit with her vision of Bregna. The producers rejected the idea because Brasília lacked the infrastructure and technical expertise to support a major film production. After several cities were scouted, Berlin and Potsdam in Germany were chosen for filming. Berlin had several locations that fit into the organic yet structured world of Æon Flux. The crew gained permission to film in several locations that had never allowed such access before, including the Treptow Crematorium, the Adlershof Trudelturm and Windkanal wind tunnel facility, and the Haus der Kulturen der Welt ("House of the World's Cultures"). Additional locations included the Bauhaus Archive and a dissection theatre built in 1790 to train veterinarians, part of the Berlin animal shelter. It was used as the Handler space. Filming was temporarily suspended for a month during September 2004 while Theron recovered from a neck injury she sustained during stunt-work on the tenth day of shooting. She was hospitalized in Berlin for five days and required about six weeks of physiotherapy to recover.
 Links: a. Berlin b. Girlfight c. Matt Manfredi d. Phil Hay (screenwriter)

Ex Output:
a


Ex Input:
Question: How long had the Royal Canadian Air Force existed the year that the McDonnell CF-101 Voodoo began being operated by them? Passage:The McDonnell CF-101 Voodoo was an all-weather interceptor aircraft operated by the Royal Canadian Air Force and the Canadian Forces between 1961 and 1984. They were manufactured by the McDonnell Aircraft Corporation of St. Louis, Missouri for the United States Air Force (as F-101s), and later sold to Canada. CF-101s replaced the obsolete Avro CF-100 Canuck in the RCAF's all-weather fighter squadrons. The Voodoo's primary armament was nuclear AIR-2A Genie unguided air-to-air rockets, and there was significant political controversy in Canada about their adoption. Although they never fired a weapon in wartime, the CF-101 served as Canada's primary means of air defence from Quick Reaction Alert facilities at Canadian airbases. The CF-101s were retired in the 1980s and replaced with McDonnell Douglas CF-18 Hornet fighters. Many examples are preserved in museums and parks in Canada and the United States.
 Links: a. AIR-2 Genie b. Royal Canadian Air Force c. McDonnell Douglas CF-18 Hornet d. Royal Canadian Air Force

Ex Output:
b


Ex Input:
Question: How many LGBTI human rights violations did the group find in 2017? Passage:Unclassified discussions open to the public at UNHQ occur once or twice a year and an RSVP is regularly announced on Twitter. An event held on December 10, 2015 looked at The Economic Cost of LGBT Exclusion and offered fiscal effects from exclusionary practices from the World Bank who estimated it to be 5% of GDP and included the companion video released by the UN's Free & Equal campaign. International concerns of the UN such as extreme hunger or clean water supplies could be remedied if this 5% of GDP was reallocated. At that meeting, the UNDP announced the launch of their LGBTI Inclusions Index, a global collection of data which they hope will help sway minds and move countries toward a brighter future for LGBTQ+ citizens. Another topic speaker on that day was the CEO of Out & Equal who recounted her 20-year efforts working with Fortune 500 and 1000 companies watching them move from 5% inclusion in 1995 to 90% inclusion by 2015. On September 20, 2017, the Group held an event entitled Ending Violence and Discrimination against LGBTI Persons. This included firsthand reports of Human Rights violations. For May 17, 2018 on International Day Against Homophobia, Transphobia and Biphobia, the UN LGBTI Core Group Special Event Celebrating our Allies opened with remarks by the UK Ambassador.
 Links: a. Human rights b. United Nations Development Programme c. International Day Against Homophobia, Transphobia and Biphobia d. United Nations Development Programme

Ex Output:

a