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: Did Vordtriede's family join him in America beside his mother? Passage:After the Nazis came to power, he emigrated to Switzerland in 1933 and to the United States later. He began his studies in Zurich and worked part-time as a house teacher. Meanwhile, he wrote articles and book reviews for the Neue Zürcher Zeitung, using several pseudonyms because of prohibition of work. He earned his PhD and taught French and German Literature at various universities, including Princeton University and University of Wisconsin-Madison. During a journey to Europe, Vordtriede was surprised by the outbreak of the Second World War and interned as an Enemy alien in occupied France. By interventions, he became free months later and was allowed to go back to America. He met his mother in New York City late in 1941, who also emigrated to the USA. He received the American citizenship in 1946 and became a Guggenheim Fellow in 1957. His sister Fränze emigrated in 1947 and went to Philadelphia.
 Links: a. University of Wisconsin–Madison b. Philadelphia c. University of Wisconsin–Madison d. Switzerland
Example Output: b

Example Input: Question: Was Willemstad successfully defended against the French in 1793? Passage:By the 1790s Braak was in the Caribbean, and was present at the defence against the French of Willemstad, part of the Dutch colony at Curaçao, in 1793. By late 1794 she was ordered to escort a convoy of East Indiamen to Batavia in the Netherlands East Indies. En route she called at the English port of Falmouth, unaware that the French had since invaded the Netherlands and proclaimed the Batavian Republic as a client state, compelling the Dutch to declare war on the British. On the arrival of the convoy at falmouth, the Royal Navy seized the 26 merchantmen and six warships of the convoy, including De Braak. A boarding party from the sloop-of-war took over De Braak. Forty-six Royal Navy vessels that were at Plymouth shared in the prize money.
 Links: a. Warship b. Willemstad c. Batavian Republic d. Willemstad
Example Output: b

Example Input: Question: Which province had a larger population the year Fraser moved to Alberta, British Columbia or Ontario? Passage:Scott Fraser was born and raised in Ottawa, Ontario, and attended Carleton University. In 1979 he moved to Alberta and worked on the oil rigs throughout the province and in the Arctic. He eventually moved to Vancouver, British Columbia, then, in 1992, to Tofino. With his wife and young daughter, he opened a bed and breakfast business. Only four years later, Fraser became the mayor of Tofino. He was mayor from November 1996 to November 1999, a time when tourism was over-taking logging and fishing as the town's dominant industry. Fraser was supportive of the application to the United Nations to designate Clayoquot Sound as a biosphere site; Clayoquot Sound was listed as a Biosphere Reserve in 2000. Fraser was the subject of a complaint filed at the British Columbia Ombudsman by one of his councillors, Ken Gibson. The mayor and council issued a resolution stating that Gibson had violated conflict-of-interest laws, using his position on council to influence zoning restrictions on his property. Gibson challenged the resolution at the BC Supreme Court which ruled in Gibson's favour, ordering that Gibson be re-instated as a councillor. The mayor and council voted in favour of appealing the decision but the Court of Appeal upheld the decision. Fraser was defeated in his attempt at re-election as mayor. In 2000, the former mayor was appointed to Tourism BC's board of directors and to the Clayoquot Sound Central Region Board which considered pre-treaty land use-related decisions. He accepted job as an assistant manager of the Tofino Harbour Authority and served as the chairman of the Working Sound Shellfish Committee.
 Links: a. Tourism British Columbia b. Tourism British Columbia c. Ontario d. World Network of Biosphere Reserves in Europe and North America
Example Output:
c