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: What's the average lifespan of the animal that has a jaw with properties similar to those that probably led to the evolution of baleen? Passage:The oldest true fossils of baleen are only 15 million years old because baleen rarely fossilizes, and scientists believe it originated considerably earlier than that. This is indicated by baleen-related skull modifications being found in fossils from considerably earlier, including a buttress of bone in the upper jaw beneath the eyes, and loose lower jaw bones at the chin. Baleen is believed to have evolved around 30 million years ago, possibly from a hard, gummy upper jaw, like the one a Dall's porpoise has; it closely resembles baleen at the microscopic level. The initial evolution and radiation of baleen plates is believed to have occurred during Early Oligocene when Antarctica broke off from Gondwana and the Antarctic Circumpolar Current was formed, increasing productivity of ocean environments. This occurred because the current kept warm ocean waters away from the area that is now Antarctica, producing steep gradients in temperature, salinity, light, and nutrients, where the warm water meets the cold.
 Links: a. Antarctic Circumpolar Current b. Dall's porpoise c. Salinity d. Salinity

Ex Output:
b


Ex Input:
Question: Who earned the bronze medal in the event where the Austrian athlete earned the gold? Passage:Sonja Henie of Norway won her third straight gold medal in the ladies' singles figure skating event, her last Olympic medal as she turned professional shortly after the Games. Karl Schäfer of Austria also successfully defended his men's singles figure skating title from Lake Placid. Sweden swept the medals in the cross-country 50 km, as did Norway in the Nordic combined. Norway's Ivar Ballangrud was the most successful athlete, winning three golds and a silver in speed skating and taking his career total to seven Olympic medals. Other multiple medal winners were Oddbjørn Hagen of Norway (one gold, two silvers), Ernst Baier of Germany (one gold, one silver), Joseph Beerli of Switzerland (one gold, one silver), Erik August Larsson of Sweden (one gold, one bronze), Birger Wasenius of Finland (two silvers, one bronze), Olaf Hoffsbakken of Norway (two silvers), Fritz Feierabend of Switzerland (two silvers) and Sverre Brodahl of Norway (one silver, one bronze).
 Links: a. Figure skating at the 1936 Winter Olympics – Men's singles b. Nordic combined at the 1936 Winter Olympics c. Fritz Feierabend d. Nordic combined at the 1936 Winter Olympics

Ex Output:
a


Ex Input:
Question: What types of programming does the New Hellenic Television station provide other than documentaries? Passage:He was born in Athens in 1961. He studied Law at the National and Kapodistrian University of Athens. He started his journalistic career in 1986 writing for the newspaper I PROTI until 1989. He has been a Germany correspondent for the daily Greek newspaper Kathimerini from 1990 to 1997 and for the Mega Channel from 1993 to 2000. For two years from 1998, Tasos Telloglou along with the journalists Alexis Papahelas and Pavlos Tsimas, presented the program "Mavro Kouti" ("The Black Box") in Mega Channel. In 2001 he started writing for the newspaper To Vima. In 2001 he worked with Pavlos Tsimas and Yorgos Kouvaras for the news program "Kokkino Pani" ("Red Flag") on ANTENNA TV. From June 2002 to July 2004, he worked for the New Hellenic Television presenting the monthly documentary series "Monitor" and "Striptease". In October 2004, he presented his first report in the program "Oi Fakeloi " ("The Folders") in Mega Channel and was editor in chief until 2007. From October 2007, he co-hosts the newsprogram "Oi Neoi Fakeloi" ("The New Folders "), the continuation of the program "Oi Fakeloi ", along with Alexis Papahelas and Sofia Papaioannou in Skai TV.
 Links: a. Alexis Papahelas b. To Vima c. Skai TV d. ERT2

Ex Output:

d