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: what is the total number of integers between 200 and 500 that are divisible by 25 ?
Options: a. 20, b. 25, c. 14, d. 15, e. 18
Example Output: d

Example Input: Problem: calculate the share of z, if rs. 3720 is divided among x, y and z in the ratio 7: 8: 11 ?
Options: a. 1564.1, b. 1214.1, c. 1574.1, d. 1271.1, e. 1044.1
Example Output: c

Example Input: Problem: buffalo gives 4 liter milk, cow gives ( 1 / 2 ) liter milk and goat gives 1 / 4 liter milk. you have to get 20 liter milk by 20 animals. what is the number of goats ?
Options: a. 1, b. 2, c. 3, d. 4, e. 5
Example Output:
b