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: a no. when divided by 221 gives a remainder 43, what remainder will beobtained by dividingthe same no. 17 ?
Options: a. 3, b. 6, c. 9, d. 10, e. 12

Ex Output:
c


Ex Input:
Problem: if x ^ 2 – 4 x = 5, then one possible value of x – 2 =
Options: a. - 9, b. - 5, c. - 3, d. - 1, e. 5

Ex Output:
c


Ex Input:
Problem: the speed of a boat in still water is 20 km / hr and the rate of current is 5 km / hr. the distance travelled downstream in 18 minutes is :
Options: a. 9.5, b. 5.5, c. 7.5, d. 6.5, e. 5.1

Ex Output:

c