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: there are 750 male and female participants in a meeting. half the female participants and one - quarterof the male participants are democrats. one - third of all the participants are democrats. how many of the democrats are female ?
Options: a. 75, b. 100, c. 125, d. 175, e. 225

Ex Output:
c


Ex Input:
Problem: what is the total number of integers between 200 and 500 that are divisible by 25 ?
Options: a. 20, b. 25, c. 14, d. 15, e. 18

Ex Output:
d


Ex Input:
Problem: a goods train runs at the speed of 72 km / hr and crosses a 250 m long platform in 15 sec. what is the length of the goods train ?
Options: a. 299, b. 277, c. 276, d. 270, e. 50

Ex Output:

e