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 the average of 5 positive integers is 50 and the difference between the largest and the smallest of these 5 numbers is 10, what is the maximum value possible for the largest of these 5 integers ?
Options: a. 50, b. 58, c. 49, d. 48, e. 44

Ex Output:
b


Ex Input:
Problem: if the simple interest on a certain sum of money for 6 years is one – fifth of the sum, then the rate of interest per annum is
Options: a. 3.3 %, b. 7.2 %, c. 6.1 %, d. 5.0 %, e. 3.1 %

Ex Output:
a


Ex Input:
Problem: in a class, there are 18 boys who are over 160 cm tall. if these constitute 3 - fourths of the boys and the total number of boys is two - thirds of the total number of students in the class, what is the number of girls in the class ?
Options: a. 11, b. 12, c. 28, d. 27, e. 19

Ex Output:

b