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 year did Vaughn's producer form hiw own label after leaving Mercury? Passage:In 1971, Bob Shad, who had worked with her as producer at Mercury, asked her to record for his label, Mainstream, which he had founded after leaving Mercury. Breaking a four-year hiatus, Vaughan signed a contract with Mainstream and returned to the studio for A Time in My Life, a step away from jazz into pop music with songs by Bob Dylan, John Lennon, and Marvin Gaye arranged by Ernie Wilkins. She didn't complain about this eclectic change in direction, but she chose the material for her next album after admiring the work of Michel Legrand. He conducted an orchestra of over one hundred musicians for Sarah Vaughan with Michel Legrand, an album of compositions by Legrand with lyrics by Alan and Marilyn Bergman. The songs brought some of the musicians to tears during the sessions. But Shad wanted a hit, and the album yielded none. She sang a version of the pop hit "Rainy Days and Mondays" by the Carpenters for Feelin' Good. This was followed by Live in Japan, her first live album since 1963. Sarah Vaughan and the Jimmy Rowles Quintet (1974) was more experimental, containing free improvisation and some unconventional scatting.
 Links: a. Mainstream Records b. John Lennon c. Feelin' Good (Sarah Vaughan album) d. Marvin Gaye

Ex Output:
a


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 actor was cast as the title role in the Batwoman series following her appearance in the crossover? Passage:In May 2018, The CW president Mark Pedowitz and Arrow lead Stephen Amell announced at The CW's upfront presentation that Batwoman, fighting alongside the other Arrowverse heroes, would be introduced in the upcoming crossover. The fictional Gotham City would also appear. Despite the inclusion of the character and city, the crossover would not include the television series Gotham that airs on Fox. That July, the CW was planning a potential standalone Batwoman series after her appearance in the crossover; Caroline Dries, who was creating and writing the potential Batwoman series, was expected to consult on the crossover. It was confirmed that Legends of Tomorrow would not feature in the crossover. Legends of Tomorrow co-showrunner Phil Klemmer said because the crossover was being used to launch the Batwoman-led series, "it just became over capacity", and that because Legends of Tomorrow would have a 16-episode season, the crossover would have been "a tonal speed-bump, or a departure, and we just don't have time to step away from our story this year". Despite not being part of the official crossover, Legends of Tomorrow co-showrunner Keto Shimizu revealed "Legends of To-Meow-Meow", the show's episode airing the week of the crossover, would be "crossing over with ourselves" through the use of alternate time periods, and Adam Tsekhman guest stars as Gary Green in the Supergirl episode.
 Links: a. Batwoman (TV series) b. Legends of Tomorrow c. Stephen Amell d. Mark Pedowitz

Ex Output:

a