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.

Input: Consider Input: Problem: 40 is subtracted from 60 % of a number, the result is 50. find the number ?
Options: a. 150, b. 330, c. 277, d. 279, e. 712

Output: a


Input: Consider Input: Problem: two positive integers differ by 4, and sum of their reciprocals is 2. then one of the numbers is
Options: a. a. 3, b. 2, c. c. 5, d. d. 21, e. e. 28

Output: b


Input: Consider Input: Problem: find the greatest number that will divide 205, 626 and 588 leaving 5, 6 and 8 as remainders respectively
Options: a. 19, b. 17, c. 13, d. 9, e. 20


Output: e