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 did the 197th fight against in the Battle for Caen? Passage:After spending many years training in the United Kingdom the 197th Brigade, together with the rest of the 59th Division, landed in France on 29 June 1944, D-Day + 23. The division, under command of XII Corps, became part of the British Second Army, which was engaged in the Battle for Caen. With the arrival of the 59th Division General Bernard Montgomery, commanding the Anglo-Canadian 21st Army Group, decided to renew the offensive to capture the city of Caen, which was originally a D-Day objective for the British 3rd Infantry Division which ultimately failed, due mainly to heavier resistance than expected. Operation Charnwood. The brigade's first action was Operation Charnwood with 2/6th South Staffords (of 177th Brigade), along with C Company of the 7th Battalion, Royal Northumberland Fusiliers (the divisional MG Battalion), together with numerous units of the Royal Artillery under command (and 510 Field Company, RE), and supported by the Churchill tanks of the 1st East Riding Yeomanry (of 27th Armoured Brigade). The brigade suffered comparatively light casualties in Charnwood. The 197th Brigade later fought in the Second Battle of the Odon, and the Battle of the Falaise Gap.
 Links: a. Battle for Caen b. Bernard Montgomery c. General (United Kingdom) d. 21st Army Group

Ex Output:
a


Ex Input:
Question: In what state did Beck receive a college degree in 1920? Passage:Beck was born in the village of Timmersdala, Sweden as one of seven children born to Carl Melcher and Anna Helena (Jonson) Back. His father was a member of the Swedish military and the owner and operator of a lime kiln. In March 1906, at the age of 11, Beck immigrated to the United States arriving in South Dakota in the middle of April 1906. He became a naturalized citizen of the United States of May 17, 1913. He received an Artium Baccalaureus degree from Morningside College in 1920. He received a Juris Doctor from the University of Chicago Law School in 1922. During World War I, he was a Second Lieutenant in the United States Army. He served in the Field Artillery at Camp Zachary Taylor, Kentucky, where it appears he was a junior officer of the 4th Company Convalescent Center.
 Links: a. Sweden b. Morningside College c. South Dakota d. Juris Doctor

Ex Output:

b