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: if a no. when divided by 44, gives 432 as quotient and 0 as remainder. what will be the remainder when dividing thesame no. by 31
Options: a. 2, b. 4, c. 5, d. 7, e. 8
Example Output: c

Example Input: Problem: find the smallest number that should be multiplied with 54000 to make it a perfect cube.
Options: ['a. 4', 'b. 5', 'c. 6', 'd. 3', 'e. 7']
Example Output: a

Example Input: Problem: from an island, it is possible to reach the mainland by either ferry p or ferry q. ferry p travels for 3 hours at 8 kilometers per hour, while ferry q takes a route that is two times longer. if ferry p is slower than ferry q by 4 kilometers per hour, how many hours longer is the journey of ferry q compared with the journey of ferry p ?
Options: a. 1, b. 2, c. 3, d. 4, e. 5
Example Output:
a