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: 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

Ex Output:
b


Ex Input:
Problem: 11 is subtracted from 40 % of a number and results is 23. what is the number ?
Options: a. 160, b. 92, c. 88, d. 85, e. 34

Ex Output:
d


Ex Input:
Problem: divide rs. 5500 among a, b and c so that a receives 1 / 3 as much as b and c together and b receives 1 / 5 as a and c together. a ' s share is ?
Options: a. 1227, b. 1268, c. 1375, d. 1200, e. 1210

Ex Output:

c