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: if a mixture is 1 ⁄ 7 alcohol by volume and 2 ⁄ 7 water by volume, what is the ratio of the volume of alcohol to the volume of water in this mixture ?
Options: a. 4 / 2, b. 3 / 2, c. 1 / 2, d. 5 / 2, e. 7 / 2

Ex Output:
c


Ex Input:
Problem: he average of 10 numbers is 23. if each number is increased by 4, what will the new average be ?
Options: a. 26, b. 27, c. 88, d. 99, e. 12

Ex Output:
b


Ex Input:
Problem: 35 % of the employees of a company are men. 60 % of the men in the company speak french and 40 % of the employees of the company speak french. what is % of the women in the company who do not speak french ?
Options: a. 4 %, b. 10 %, c. 96 %, d. 90.12 %, e. 70.77 %

Ex Output:

e