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.

Example Input: Question: On what date did Apollo 11 land at it's destination site? Passage: are three views of Mare Tranquillitatis on the Moon, taken by the mapping camera of the Apollo 17 mission in 1972, facing south-southwest from an average altitude of 111 km on Revolution 36 of the mission. At the left is the east side of Mare Tranquillitatis, with the craters Franz (bottom right), Lyell (dark floor, right of center), and Taruntius (upper left). The "bay" of dark mare (basalt) at left is Sinus Concordiae, with "islands" of older, light highland material. At the right is the crater Cauchy, which lies between the Rupes Cauchy and Cauchy rille. The center photo shows the central mare with craters Vitruvius (lower right) and Gardner (bottom center). At the horizon are lighter highlands at the southern margin of the mare, near the Apollo 11 landing site. The crater Jansen is visible at the edges of both the center and right photos. The right photo shows the western mare, with the craters Dawes (lower left) and the large Plinius (43 km diameter), with the Plinius Rilles in the foreground. These photos were taken within minutes of each other as the command module America orbited the Moon. The Sun elevation drops from 46 degrees at left to 30 degrees at right.
 Links: a. Apollo 11 b. Apollo 17 c. Lyell (lunar crater) d. Plinius (crater)
Example Output: a

Example Input: Question: During which centuries were the Kyoto Imperial Palace and the Sento Imperial Palace home to the Emperors of Japan? Passage:With its 2,000 religious places – 1,600 Buddhist temples and 400 Shinto shrines, as well as palaces, gardens and architecture intact – it is one of the best preserved cities in Japan. Among the most famous temples in Japan are Kiyomizu-dera, a magnificent wooden temple supported by pillars off the slope of a mountain; Kinkaku-ji, the Temple of the Golden Pavilion; Ginkaku-ji, the Temple of the Silver Pavilion; and Ryōan-ji, famous for its rock garden. The Heian Jingū is a Shinto shrine, built in 1895, celebrating the Imperial family and commemorating the first and last emperors to reside in Kyoto. Three special sites have connections to the imperial family: the Kyoto Gyoen area including the Kyoto Imperial Palace and Sentō Imperial Palace, homes of the Emperors of Japan for many centuries; Katsura Imperial Villa, one of the nation's finest architectural treasures; and Shugaku-in Imperial Villa, one of its best Japanese gardens. In addition, the temple of Sennyu-ji houses the tombs of the emperors from Shijō to Kōmei.
 Links: a. List of emperors of Japan b. List of emperors of Japan c. Kyoto Imperial Palace d. Kinkaku-ji
Example Output: c

Example Input: Question: Was Roland I the only person killed in the Battle of Mohi? Passage:Roland I was born around 1215 into the gens Rátót as the son of Dominic I, who served as Master of the treasury from 1238 to 1240. He was killed in the Battle of Mohi in 1241. The ancestors of the kindred were two Norman knights (Oliver and Rathold) from Caserta, Naples, who settled down in Hungary around 1097 during the reign of Coloman, King of Hungary. Roland's earliest known ancestor was his great-grandfather Leustach I Rátót, Voivode of Transylvania in the second half of the 12th century. Roland had three brothers, Stephen, the forefather of the Pásztói, Tari and Kakas de Kaza noble families. The Putnoki family came from Oliver I. Leustach II was the father of Palatine Roland II Rátót and also the ancestor of the Jolsvai, Serkei and Feledi branches. Their only unidentified sister married Maurice II Pok whom the influential baron Nicholas Pok originated.
 Links: a. Battle of Mohi b. Oliver Rátót c. Oliver Rátót d. Palatine of Hungary
Example Output:
a

