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.

Example Input: Problem: a cricket player whose bowling average was 21.5 runs per wicket, takes 5 wicket for 52 runs in a match. due to this his average decreases by 0.5. what will be the number of wickets taken by him till the last match ?
Options: a. 64, b. 72, c. 111, d. 721, e. 108
Example Output: c

Example Input: Problem: the total age of a and b is 12 year more than the total age of b and c. c is how many years younger than a ?
Options: a. 12, b. 24, c. data inadequate, d. none of these, e. 34
Example Output: a

Example Input: Problem: if a speaks the truth 40 % of the times, b speaks the truth 80 % of the times. what is the probability that at least one will tell the truth
Options: a. 0.18, b. 0.12, c. 1.02, d. 1.2, e. 1.3
Example Output:
b