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: 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: the area of a square field is 625 km 2. how long will it take for a horse to run around at the speed of 25 km / h ?
Options: a. 12 h, b. 10 h, c. 8 h, d. 4 h, e. none of these

Ex Output:
d

Ex Input:
Problem: how many 3 - digit integers between 311 and 401, exclusive, are divisible by 3 when the tens digit and the hundered digit are switched ?
Options: a. 30, b. 19, c. 22, d. 3, e. 90

Ex Output:
a