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: How many soldiers died in the battle that Stanley missed due to illness? Passage:He fought at several battles in Missouri, including the Battle of Wilson's Creek, where he guarded the supply trains. President Abraham Lincoln appointed Stanley as brigadier general September 28, 1861, although the U.S. Senate did not confirm the appointment until March 7, 1862. Fighting in the Western Theater, he participated in the operations against New Madrid, Missouri and the Battle of Island Number Ten. He was involved in numerous major battles, including the Second Battle of Corinth, where he commanded a division of infantry of the Army of the Mississippi, and the Battle of Stones River, in which he led the cavalry of the Army of the Cumberland. On March 11, 1863, Stanley was appointed major general to rank from November 29, 1862. Stanley also led the Union cavalry in the Tullahoma Campaign. He fell ill late in 1863 and missed the Battle of Chickamauga. In 1864, he fought under William Tecumseh Sherman as a division commander in the IV Corps of the Army of the Cumberland during the Atlanta Campaign, and he was promoted to command of the corps when Maj. Gen. Oliver O. Howard was named commander of the Army of the Tennessee. After the capture of the city, instead of employing him marching to the sea, Sherman dispatched Stanley and his IV Corps to Tennessee to help protect the state from invasion by John Bell Hood's Army of Tennessee.
 Links: a. Army of Tennessee b. Missouri c. Battle of Chickamauga d. John Bell Hood
Example Output: c

Example Input: Question: Which professional ice hockey league that McNab ever played in was formed first? Passage:After playing junior hockey in Saskatoon, Saskatchewan, McNab played on the Omaha Knights of the USHL in the 1946–48 season before being called up to the Detroit Red Wings of the National Hockey League in 1947. He would play on and off with the Red Wings until 1951, playing on the team that won the Stanley Cup in 1950. He played for the Indianapolis Capitols of the American Hockey League in 1950–51. Before the 1951–52 season, he was traded by the Red Wings to the Chicago Black Hawks, but never played for the team. Back surgery kept him out of action in 1951–52 and McNab then joined the New Westminster Royals of the Western Hockey League, where he played for seven seasons, retiring in 1959. He was voted league MVP in 1955, scoring 32 goals and 81 points.
 Links: a. Omaha Knights (AHA) b. Saskatoon c. National Hockey League d. United States Hockey League (1945–1951)
Example Output: d

Example Input: Question: How many people live in the place that Doegan was born? Passage:Donegan was born on 13 July 1961 in Stirling, and educated at St Modan's High School in Stirling and at the University of Glasgow, where his musical career began. He was the bassist in The Bluebells, whose biggest hit was "Young at Heart", and Lloyd Cole and the Commotions. After the latter group split, Donegan became a journalist and an author. Between these roles, he worked as the House of Commons assistant to Brian Wilson MP. Whilst in that role, he was part of a one-off band called the Stop Its that recorded an anti-poll tax song of a similar name. The band also included David Hill, later press spokesman for Tony Blair. and Tim Luckhurst, who later became editor of The Scotsman newspaper, and is Professor of Journalism at the University of Kent. In the late 1980s, Donegan made a number of appearances with South London football team Belair Casuals FC. He is now a golf journalist for The Guardian, having previously worked at The Scotsman. He has held a post with the former publication since 2004, although he has been at the newspaper since 1994, as a general reporter and then as the Scotland correspondent from 1997 to 2004. During the 2010 Winter Olympics, Donegan gained notoriety for his overly critical reviews of the games. Journalists believed that his harsh reviews and similar critiques coming from the British media were made as an attempt to make the games look bad as the following Olympics would be held in London. In 2012, The Guardian made a tongue-in-cheek reference to the severe criticism of the prior Games by inviting a Canadian journalist to similarly critique the Summer Olympics in London as the 'worst ever'.
 Links: a. 2012 Summer Olympics b. Stirling c. University of Glasgow d. 2012 Summer Olympics
Example Output:
b