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 long is the fault that lies to the east of Ice Mountain? Passage:Ice Mountain is an arc-shaped forested ridge of the Allegheny Mountains, part of the Ridge-and-valley Appalachians. It is above mean sea level at its summit. Ice Mountain is a large mass of Devonian Oriskany (Ridgeley) sandstone and Marcellus shale with numerous bare rock slopes and vertical cliffs. Ice Mountain lies on the west side of the Timber Mountain anticline and to the west of North Mountain fault, which places it on the Martinsburg allochthonous sheet. Ice Mountain is situated along North River and is known for the several hundred yards of ice that form at its base all year long. At its southern end overlooking the community of North River Mills is located Raven Rocks, a set of stone chimney outcrops. Raven Rocks is in height above mean sea level with vertical cliffs measuring nearly in height. Raven Rocks were named because of the presence of ravens during pioneer days. The present Raven Rocks is the remaining vestige of a once towering cliff that overlooked the North River. Geologically, Ice Mountain is a northern extension of North River Mountain.
 Links: a. Anticline b. Fault (geology) c. North Mountain (Virginia-West Virginia) d. Outcrop

Output: c


Input: Consider Input: Question: How old was Rudy Vallee when he reached number 15 on the Billboard charts? Passage:Rudy Vallee was the first artist to make the charts in Billboard magazine with "As Time Goes By" when he took the song to number 15 in 1931, but after the song was featured in the film Casablanca his recording was reissued and spent four weeks at number one in 1943. "Begin the Beguine" was first put on the charts by Xavier Cugat & His Waldorf-Astoria Orchestra with Don Reid on vocal for two weeks in 1935 when it reached number 13. Patti Austin's "We're in Love" made it to number 90 on the magazine's R&B chart in February 1978, and the Expanded Edition CD bonus track "I Never Said I Love You" was first recorded by Barbara Mandrell for her 1976 album Midnight Angel but was a number 84 pop hit for Orsa Lia that also spent a week at number one on the magazine's Easy Listening chart in 1979.
 Links: a. Waldorf Astoria New York b. Casablanca (film) c. Barbara Mandrell d. Rudy Vallée

Output: d


Input: Consider Input: Question: What was the population of Larne the year that Norman Surplus completed his circumnavigation of the globe in an autogyro? Passage:Norman Surplus (born 1963) is a Northern Irish pilot, who became the first person to circumnavigate the globe in an autogyro, nicknamed "Roxy". His trip began in 2010 and ended on 28 June 2019. In 2010, during the first leg of his trip, Surplus flew over Europe, the Middle East, Asia, and North America. In June 2015, Surplus commenced the second leg of his journey by flying through the United States and crossing the Atlantic Ocean to eventually land in Larne, Northern Ireland in August 2015, becoming the first person to cross the Atlantic in an autogyro. In 2019, he completed the last leg of his journey when he finally obtained permission from the Russian Federation to fly through its airspace. He left Ireland on Easter Monday in 2019, and flew through Russia to eventually reach the United States and land at the Evergreen Aviation and Space Museum in Oregon completing his circumnavigation of the globe in an autogyro. Surplus's AutoGyro MT-03 is currently displayed at the EAA Aviation Museum and will remain there for the duration of AirVenture 2020. Surplus took nine years to complete his journey around the world, and flew over 32 countries, over a total distance of . In a 2015 interview with the CBC, while on a stopover at Iqaluit, Canada, Surplus mentioned that the trip should have taken approximately four months but the problems with obtaining permission to fly over Russia, which persisted for three years, derailed his plans.
 Links: a. People of Northern Ireland b. United States c. Middle East d. Larne


Output: d