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: what is the sum of natural numbers between 30 and 100
Options: a. 4615, b. 4860, c. 5000, d. 5500, e. 5550

Output: a


Input: Consider Input: Problem: bob wants to run a mile in the same time as his sister. if bob ’ s time for a mile is currently 11 minutes 20 seconds and his sister ’ s time is currently 9 minutes 36 seconds, by what percent does bob need to improve his time in order run a mile in the same time as his sister ?
Options: a. 3 %, b. 5 %, c. 8 %, d. 10 %, e. 15 %

Output: e


Input: Consider Input: Problem: sushil got thrice as many marks in english as in science. his total marks in english, science and maths are 152. if the ratio of his marks in english and maths is 1: 5, find his marks in science ?
Options: a. 8, b. 77, c. 66, d. 55, e. 31


Output: a