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: an 80 - liter solution of cool - drink is made from 10 % jasmine water. if 5 liters of jasmine and 15 liters of water were added to the solution, what percent of the solution is jasmine ?
Options: a. 11 %, b. 13 %, c. 15 %, d. 17 %, e. 19 %

Ex Output:
b


Ex Input:
Problem: 1391 x 1391 = ?
Options: a. a. 1951609, b. b. 1951601, c. c. 1951602, d. d. 1951603, e. e. 1934881

Ex Output:
e


Ex Input:
Problem: a 75 - liter solution of cool - drink is made from 8 % jasmine water. if 3 liters of jasmine and 12 liters of water were added to the solution, what percent of the solution is jasmine ?
Options: a. 10.3 %, b. 11.5 %., c. 10 %., d. 12.2 %, e. 12 %.

Ex Output:

c