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: how many prime numbers are between 76 / 8 and 124 / 5 ?
Options: a. 1, b. 2, c. 3, d. 4, e. 5

Ex Output:
e


Ex Input:
Problem: in n is a positive integer less than 200, and 14 n / 60 is an integer, then n has how many different positive prime factors s ?
Options: a. 2, b. 3, c. 5, d. 6, e. 8

Ex Output:
b


Ex Input:
Problem: if x is the median of the set { 8 / 2, 11 / 3, 27 / 9, 21 / 5, x }, x could be
Options: a. 4, b. 17 / 5, c. 16 / 5, d. 30 / 7, e. 31 / 7

Ex Output:

a