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: Are there any penguins on any of the islands Otto visited? Passage:He led the 1901-1904 Swedish Antarctic Expedition, aboard the ship Antarctic. The expedition visited the Falkland Islands before the ship, commanded by seasoned Antarctic sailor Carl Anton Larsen, dropped Nordenskjöld's party off at Snow Hill Island, a small island off the coast of the Antarctic Peninsula. Nordenskiöld overwintered at Snow Hill Island, while Antarctic returned to the Falklands. The following summer Larsen brought her south, intending to retrieve the Nordenskiöld party, but she became trapped in ice which eventually crushed her hull, forcing Larsen and his crew to overwinter in a hastily constructed shelter on Paulet Island. Larsen and Nordenskjöld finally rendezvoused at their fall-back rescue hut at Hope Bay in late 1903, where they were picked up by the Argentine Navy corvette ARA Uruguay (commanded by Julián Irízar), which had been dispatched when Antarctic had failed to make her appointed return to South America the previous year. Despite its end and the great hardships endured, the expedition was considered a scientific success, with the parties having explored much of the eastern coast of Graham Land, including Cape Longing, James Ross Island, the Joinville Island group, and the Palmer Archipelago. The expedition, which also recovered valuable geological samples and samples of marine animals, earned Nordenskjöld lasting fame at home, but its huge cost left him greatly in debt.
 Links: a. Graham Land b. Palmer Archipelago c. Falkland Islands d. ARA Uruguay
Example Output: c

Example Input: Question: Who plays Spiderman in the movie that Topher Grace appeared in in 2007? Passage:Eric is a well-known fan of science fiction, such as  and especially Star Wars, in which he compares himself to Luke Skywalker. He is also known to have a large, beloved collection of G.I. Joe. He listens to artists such as Led Zeppelin, KISS, Aerosmith, Pink Floyd, Lynyrd Skynyrd, Deep Purple, Queen, Styx and Rush. He is also a Beatles fan and has been known to liken his group of friends to them, accusing Jackie of "breaking up the band" with her romantic entanglements with Kelso and Hyde (calling her Yoko, in reference to Yoko Ono). It is also hinted that he is both a Batman and Spider-Man fan, having Spider-Man bed sheets and a considerable number of comic books, most of them bearing the Marvel Comics logo with the titular character on the covers. When he fights a fan at the Packers game, he tells Red that he learned his moves from Spider-Man; coincidentally, Topher Grace starred as Eddie Brock, a character who obtains powers very similar to Spider-Man, thus transforming him into the monstrous Venom in Spider-Man 3 in 2007.
 Links: a. The Beatles b. Styx (band) c. Spider-Man 3 d. Styx (band)
Example Output: c

Example Input: Question: Which two countries did Crusoe visit before he arrived back in London? Passage:Argun was the first town on the Russian border; then they went through Nertzinskoi (Nerchinsk), Plotbus, touched a lake called Schaks Ozer, Jerawena, the river Udda, Yeniseysk, and Tobolsk (from September 1703 to beginning of June 1704). They arrived in Europe around the source of the river Wirtska, south of the river Petrou, in a village called Kermazinskoy near Soloy Kamskoy (Solikamsk). They passed a little river called Kirtza, near Ozomoys (or Gzomoys), came to Veuslima (?) on the river Witzogda (Vychegda), running into the Dwina, then they stayed in Lawrenskoy (3–7 July 1704; possibly Yarensk, known as Yerenskoy Gorodok at that time). Finally Crusoe arrived at the White Sea port town Arch-Angel (Archangelsk) on 18 August, sailed into Hamburg (18 September), and Hague. He arrived at London on 10 January 1705, having been gone from England ten years and nine months.
 Links: a. Hamburg b. Northern Dvina River c. Argun, Russia d. Argun, Russia
Example Output:
a