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.

Input: Consider Input: Question: Which team won the NHL's championship trophy the year after Smith's team achieved the feat in 1970? Passage:Smith was originally drafted by the Boston Bruins in the second round (7th overall) in the 1966 NHL Amateur Draft. He played in Boston from 196869 to 197172. Boston traded him in 1972 to the California Golden Seals of the NHL. He played there until the end of the next season (197273) when he left the NHL for the World Hockey Association (WHA) and played for the Minnesota Fighting Saints. In 197576 Smith returned to the NHL to play for the St. Louis Blues. He would remain with the Blues until the 197677 NHL season when he returned to the Boston Bruins. In 1980 Rick Smith would leave Boston to play one more NHL season split between the Detroit Red Wings (11 games) and the Washington Capitals (40 games). He won the Stanley Cup with the Boston Bruins in 1970. Rick Smith was a steady defenseman, not a scorer but a reliable part of talented teams. An important part of winning Bruin teams who worked hard in every game he participated in.
Links: a. 196869 NHL season b. Detroit Red Wings c. 197172 NHL season d. Boston Bruins

Output: d

Input: Consider Input: Question: In what city and country was the Jagdgeschwader 77 based? Passage:Born in Cologne-Lindenthal, Reinert volunteered for military service in the National Socialist Luftwaffe in 1938. Following flight training, he was posted to Jagdgeschwader 77 (JG7777th Fighter Wing). He fought in Operation Barbarossa, the German invasion of the Soviet Union, and claimed his first aerial victory on 8 August 1941. He received the Knight's Cross of the Iron Cross following his 53rd aerial victory. Accumulating further victories, he surpassed the century mark in October 1942 for which he was awarded the Knight's Cross of the Iron Cross with Oak Leaves. In November 1942, his unit was transferred to the Mediterranean theatre in support of the Afrika Korps. There, Reinert claimed 51 victories against the Western Allies. In August 1943, he was appointed Staffelkapitan (squadron leader) of 1. Staffel (1st squadron) of JG77, and in February 1944 the 8. Staffel of Jagdgeschwader 27 (JG2727th Fighter Wing) based in France. Reinert was then appointed Gruppenkommandeur (group commander) of IV. Gruppe (4th group) of JG27 and, credited with 174 aerial victories, received the Knight's Cross of the Iron Cross with Oak Leaves and Swords on 30 January 1945. He then received conversion training to the then new Messerschmitt Me 262 jet fighter and was posted to Jagdgeschwader 7 (JG77th Fighter Wing), an all-jet fighter wing.
Links: a. Jagdgeschwader b. Knight's Cross of the Iron Cross c. Jagdgeschwader 27 d. Knight's Cross of the Iron Cross

Output: a

Input: Consider Input: Question: How many acres is the largest protected area of tallgrass prairie in the world? Passage:Oklahoma has 41 state parks, two national protected forests or grasslands, and a network of wildlife preserves and conservation areas. Six percent of the state's 10 million acres (40,000km) of forest is public land, including the western portions of the Ouachita National Forest, the largest and oldest national forest in the southern United States. With , the Tallgrass Prairie Preserve in north-central Oklahoma is the largest protected area of tallgrass prairie in the world and is part of an ecosystem that encompasses only 10 percent of its former land area, once covering 14 states. In addition, the Black Kettle National Grassland covers of prairie in southwestern Oklahoma. The Wichita Mountains Wildlife Refuge is the oldest and largest of nine national wildlife refuges in the state and was founded in 1901, encompassing . Of Oklahoma's federally protected park or recreational sites, the Chickasaw National Recreation Area is the largest, with . Other federal protected sites include the Santa Fe and Trail of Tears national historic trails, the Fort Smith and Washita Battlefield national historic sites, and the Oklahoma City National Memorial.
Links: a. Chickasaw National Recreation Area b. Tallgrass Prairie Preserve c. Black Kettle National Grassland d. Black Kettle National Grassland
Output: b