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: What is the definition of the Werther effect? Passage:In July 1994, two students of Taipei First Girls' High School committed suicide by charcoal-burning in a hotel in Su'ao, Yilan with a note that didn't state the reason clearly, even though that it was suspected in some mass media that they were a lesbian couple. In November 1998, a middle-aged woman in Hong Kong died by suicide using this method inside her small, sealed bedroom. She had a chemical engineering background. Hong Kong was suffering from an economic depression at the time, and suicide in general was increasing. After the details of this suicide were highly publicised by local mass media, many others killed themselves in this way (an example of the Werther effect). Within two months, charcoal-burning had become the third major suicide killer in Hong Kong. Charcoal-burning suicide accounted for 1.7% of Hong Kong suicides in 1998 and 10.1% in 1999. By 2001, it had surpassed hanging as the second most-common method of suicide in Hong Kong (second only to jumping), accounting for about 25% of all suicide deaths. The method has since spread to mainland China, Taiwan and Japan.
Links: a. Hong Kong b. Jumper (person) c. Copycat suicide d. Chemical engineering
Example Output: c

Example Input: Question: Who came in third place the year that Chico Serra won the British Formula 3 Championship? Passage:Francisco "Chico" Serra (born 3 February 1957 in Sao Paulo) is a racing driver from Brazil. He won the 1979 British Formula 3 Championship. He participated in 33 Formula One World Championship Grands Prix for Fittipaldi and Arrows, debuting on 15 March 1981. He made 18 starts, not qualifying for the remaining fifteen races, although he ought to have started as the reserve in the 1982 Swiss Grand Prix. However, Ferrari withdrew Patrick Tambay's entry so late that Serra was not allowed to take part. Serra scored one championship point, for finishing sixth in the 1982 Belgian Grand Prix. After qualifying for the 1982 Canadian Grand Prix, Serra and countryman Raul Boesel had a short scuffle. Serra was furious at Boesel for blocking his last flying lap after waving Keke Rosberg by. Boesel denied that this was intentional. Serra made one CART Champ Car start in 1985 at the Portland International Raceway for Ensign Racing but suffered an engine failure.
Links: a. British Formula 3 International Series b. Scuderia Ferrari c. British Formula 3 International Series d. 1982 Belgian Grand Prix
Example Output: a

Example Input: Question: In which country was Ariadne auf Naxos first presented? Passage:In 1926, the opera was first presented at the Salzburg Festival, staged by Lothar Wallerstein in Viennese settings, twice conducted by Clemens Krauss and once by Richard Strauss himself. Lotte Lehmann was Salzburg's first Ariadne. Wallerstein was also the stage director of the second Viennese production in 1935, with settings by Oskar Strnad and costumes by Ladislaus Czettel. Josef Krips conducted. There were 38 performances until September 1943. Three months later a new production by Heinz Arnold was presented, with settings by Wilhelm Reinking and conducted by Karl Bohm. The cast featured Maria Reining as Ariadne, Max Lorenz as Bacchus, Alda Noni as Zerbinetta, Irmgard Seefried as composer, Paul Schoffler as Musiklehrer, Erich Kunz as Harlekin and Emmy Loose as Najade. Due to the war this production could only be shown seven times.
Links: a. Salzburg Festival b. Josef Krips c. Clemens Krauss d. Irmgard Seefried
Example Output:
a