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: On what date did Apollo 11 land at it's destination site? Passage: are three views of Mare Tranquillitatis on the Moon, taken by the mapping camera of the Apollo 17 mission in 1972, facing south-southwest from an average altitude of 111km on Revolution 36 of the mission. At the left is the east side of Mare Tranquillitatis, with the craters Franz (bottom right), Lyell (dark floor, right of center), and Taruntius (upper left). The "bay" of dark mare (basalt) at left is Sinus Concordiae, with "islands" of older, light highland material. At the right is the crater Cauchy, which lies between the Rupes Cauchy and Cauchy rille. The center photo shows the central mare with craters Vitruvius (lower right) and Gardner (bottom center). At the horizon are lighter highlands at the southern margin of the mare, near the Apollo 11 landing site. The crater Jansen is visible at the edges of both the center and right photos. The right photo shows the western mare, with the craters Dawes (lower left) and the large Plinius (43km diameter), with the Plinius Rilles in the foreground. These photos were taken within minutes of each other as the command module America orbited the Moon. The Sun elevation drops from 46 degrees at left to 30 degrees at right.
Links: a. Apollo 11 b. Apollo 17 c. Lyell (lunar crater) d. Plinius (crater)

Output: a

Input: Consider Input: Question: How deep were their heavy infantry formations normally? Passage:Having recovered from their losses at Trebia (218 BC) and Lake Trasimene (217 BC), the Romans decided to engage Hannibal at Cannae, with approximately 86,000 Roman and allied troops. They massed their heavy infantry in a deeper formation than usual, while Hannibal used the double envelopment tactic and surrounded his enemy, trapping the majority of the Roman army, who were then slaughtered. The loss of life on the Roman side was one of the most lethal single day's fighting in history; Adrian Goldsworthy equates the death toll at Cannae to "the massed slaughter of the British Army on the first day of the Somme offensive in 1916." Only about 15,000 Romans, most of whom were from the garrisons of the camps and had not taken part in the battle, escaped death. Following the defeat, Capua and several other Italian city-states defected from the Roman Republic to Carthage.
Links: a. Cannae b. Adrian Goldsworthy c. Heavy infantry d. City-state

Output: c

Input: Consider Input: Question: How many people died at the Battle of Roundway Down? Passage:The Cornish Royalist army then received orders to rendezvous with Prince Maurice's men, whom they met at Chard in Somerset in June. This combined force now took Taunton, Bridgwater, Dunster Castle and Wells. Their first contact with the Parliamentarian commander William Waller was a cavalry skirmish at Chewton Mendip. Waller was driven out of Monkton Farleigh on 3 July 1643 and on 5 July, two days later, the Royalists won a pyrrhic victory at the Battle of Lansdowne. Sir Bevill Grenvile fell at the battle. The foot were now besieged in Devizes but witnessed the destruction of Waller's forces at Roundway Down. The Western Royalists took Bath, and after joining Prince Rupert on 26 July 1643 they stormed Bristol. The Battle lasted over thirteen hours and at the end the Royalist had taken the City, but lost both Sir Nicholas Slanning and Sir John Trevanion. The Cornish returned to Devon, and unfer Prince Maurice, they took Exeter on 4 September and Dartmonth on 6 October, and arrived back near Plymouth for the winter. Godolphin was knighted at Oxford on 6 May 1644. Later in the year the Royalist captured and disbanded the parliamentary army of the Earl of Essex on 22 August 1644. In 1645 Godolphin's Regiment returned to Exeter to become one of the garrison units and was still there at the fall of the city on 9 April 1646. Godolphin was one of the signatories to the surrender.
Links: a. Battle of Roundway Down b. Battle of Roundway Down c. Maurice of the Palatinate d. Pyrrhic victory
Output: a