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: Which state where Peganum harmala is found is the most populous? Passage:It was first planted in the United States in 1928 in New Mexico by a farmer wanting to manufacture a dye called "Turkish red" from its seeds. From here the plant spread over most of southern New Mexico and the Big Bend region of Texas. An additional spread has occurred from east of Los Angeles in California to the tip of southernmost Nevada. Outside of these regions the distribution in the USA is not continuous and localised. As of 2019 it has been reported in southern Arizona (in at least 3 adjacent counties), northeastern Montana (2 adjacent counties), northern Nevada (Churchill county), Oregon (town of Prineville in the Oregon high desert) and possibly Washington. "Because it is so drought tolerant, African rue can displace the native saltbushes and grasses growing in the salt-desert shrub lands of the Western U.S."
Links: a. Montana b. Churchill County, Nevada c. New Mexico d. Oregon

Ex Output:
c

Ex Input:
Question: How many people attended the conference held near Berlin in January 1942? Passage:Following the invasion of Poland in 1939 most of the 3.5 million Polish Jews were rounded up and put into newly established ghettos by Nazi Germany. The system was intended to isolate the Jews from the outside world in order to facilitate their exploitation and abuse. The supply of food was inadequate, living conditions were cramped and unsanitary, and the Jews had no way to earn money. Malnutrition and lack of medicine led to soaring mortality rates. In 1941, the initial victories of the Wehrmacht over the Soviet Union inspired plans for the German colonisation of occupied Poland, including all territory within the new district of General Government. At the Wannsee Conference held near Berlin on 20 January 1942, new plans were outlined for the genocide of the Jews, known as the "Final Solution" to the Jewish Question. The extermination programme was codenamed Aktion Reinhard in German, to differentiate it from the Einsatzgruppen mass killing operations in territories conquered by Nazi Germany, in which half a million Jews had already been annihilated.
Links: a. Einsatzgruppen b. Wannsee Conference c. Operation Reinhard d. General Government

Ex Output:
b

Ex Input:
Question: How old was Marc Rosset when he won the first Open in 1993? Passage:Before this year, the tournament was won by a home favorite on several occasions: Guy Forget in 1996, Fabrice Santoro in 1999, Arnaud Clement in 2006, and Gilles Simon in 2007. The record for most titles is three, won by the Swiss player Marc Rosset in its first two years in 1993 and 1994, as well as in 2000; the Swedish player Thomas Enqvist also won three, in 1997, 1998, and 2002. It is also one of the few ATP tournaments to have been won only by European players, with France with five (Forget, Santoro, Clement, Simon, and this year's winner Jo-Wilfried Tsonga), Sweden with 4 (Enqvist, Joachim Johansson), Switzerland with four (Rosset, Roger Federer), Germany with one (Boris Becker), Russia with one (Yevgeny Kafelnikov), Slovakia with one (Dominik Hrbaty), and Great Britain with one (Andy Murray).
Links: a. Marc Rosset b. Fabrice Santoro c. Marc Rosset d. Joachim Johansson

Ex Output:
a