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 long did the Siege of Boston last? Passage:The Battle of Lexington and Concord was the first conflict in the American Revolutionary War. On April 19, 1775, a force of British Army regulars marched from Boston to Concord to capture a cache of arms that was reportedly stored in the town. Forewarned by Samuel Prescott (who had received the news from Paul Revere), the colonists mustered in opposition. Following an early-morning skirmish at Lexington, where the first shots of the battle were fired, the British expedition under the command of Lt. Col. Francis Smith advanced to Concord. There, colonists from Concord and surrounding towns (notably a highly drilled company from Acton led by Isaac Davis) repulsed a British detachment at the Old North Bridge and forced the British troops to retreat. Subsequently, militia arriving from across the region harried the British troops on their return to Boston, culminating in the Siege of Boston and the outbreak of the war.
Links: a. Old North Bridge b. Paul Revere c. Siege of Boston d. Isaac Davis (soldier)
Example Output: c

Example Input: Question: When did the event where Frank Alberry won a Distinguished Conduct Medal end? Passage:Frank Alberry, DCM (29 September 1892 23 January 1968) was an Australian soldier and airman who had a varied military career. Born in Hobart, he served in the Welch Regiment of the British Army before the First World War, but deserted. He joined up again in the early days of the First World War, and went on to serve with the 8th Battalion of the Australian Imperial Force. After service at Gallipoli, he joined the British Expeditionary Force in France. He won a Distinguished Conduct Medal at the Battle of Pozieres, but lost a lower leg in the process. Alberry took the extraordinary step of personally petitioning King George V for permission to transfer to the Flying Corps, and subsequently became a flying ace credited with seven aerial victories. Alberry returned to service during the Second World War as a recruiter.
Links: a. Distinguished Conduct Medal b. Battle of Pozieres c. 8th Battalion (Australia) d. World War II
Example Output: b

Example Input: Question: When was the person born with whom Charles tied for fourth at the 1936 World Championship final? Passage:Prior to taking up speedway, Charles worked as a baker and grocer, and performed in music halls with a piano accordion. In 1929 Charles rode for Burnley, in 1930 for Manchester White City and then for Leeds Lions and Belle Vue in 1931 but was badly injured and lost his form, and so retired from the sport. In 1933, the Belle Vue Aces tempted him out of retirement, and looked to have regained his former form when he won the Wembley championship that year, also breaking the track record. In 1934 Charles' father died, so he returned to the family business. In 1935 Wembley Lions paid 1,000 to sign Charles, where he became the club's top scorer and was selected to ride for England against Australia. He went on to win the Star Riders' Championship despite only initially taking part in the competition as a replacement for Ginger Lees. In 1936 he topped the club's scoring again, was top scorer for the England Test team, and qualified for World Championship final, tying for fourth place with Cordy Milne, and broke the track record during the meeting. He qualified again for the 1937 final. At the end of the 1938 season he decided to retire to concentrate on his long-term hobby of gliding.
Links: a. Cordy Milne b. Cordy Milne c. Music hall d. White City, Greater Manchester
Example Output:
a