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: ravi purchased a refrigerator and a mobile phone for rs. 15000 and rs. 8000 respectively. he sold the refrigerator at a loss of 5 percent and the mobile phone at a profit of 10 percent. overall he make a.
Options: a. 50, b. 288, c. 27, d. 200, e. 881

Ex Output:
a


Ex Input:
Problem: if a train, travelling at a speed of 90 kmph, crosses a pole in 4 sec, then the length of train is ?
Options: a. 281, b. 125, c. 288, d. 100, e. 121

Ex Output:
d


Ex Input:
Problem: an 80 - liter solution of cool - drink is made from 10 % jasmine water. if 8 liters of jasmine and 12 liters of water were added to the solution, what percent of the solution is jasmine ?
Options: a. 12 %, b. 14 %, c. 16 %, d. 18 %, e. 20 %

Ex Output:

c