Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

Ex Input:
Problem: if price of t. v set is reduced by 20 %, then its sale increases by 80 %, find net effect on sale value
Options: a. 44, b. 45, c. 46, d. 47, e. 48

Ex Output:
a


Ex Input:
Problem: the batting average of a particular batsman is 60 runs in 46 innings. if the difference in his highest and lowest score is 140 runs and his average excluding these two innings is 58 runs, find his highest score.
Options: a. 179, b. 367, c. 269, d. 177, e. 174

Ex Output:
e


Ex Input:
Problem: a car gets 40 kilometers per gallon of gasoline. how many gallons of gasoline would the car need to travel 120 kilometers ?
Options: a. 4.5, b. 5.5, c. 6.5, d. 3, e. 8.5

Ex Output:

d