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.

Input: Consider 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']

Output: a


Input: Consider Input: Problem: the average of first six prime numbers greater than 20 is ?
Options: a. 10, b. 20, c. 30, d. 40, e. 34

Output: e


Input: Consider Input: Problem: boy sells a book for rs. 540 he gets a loss of 10 %, to gain 10 %, what should be the sp ?
Options: a. 430, b. 450, c. 550, d. 590, e. 660


Output: e