You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

Ex Input:
Question: If x is positive and y is negative, which of the following must be true?

Option A: The product of x and y is positive

Option B: The sum of x and y is positive

Option C: The sum of x and y is negative

Option D: The difference of x and y is positive

Option E: The sum of x^2 and y^2 is positive

Ex Output:
Option E

Ex Input:
Question: Find the odd one out:
125, 106, 85, 76, 65, 58, 53

Option A: 33

Option B: 85

Option C: 26

Option D: 18

Option E: 222

Ex Output:
Option B

Ex Input:
Question: If a and b are positive numbers, and a^3 + b^3 = 100, then the greatest possible value of a is between:

Option A: 0 and 3

Option B: 3 and 4

Option C: 4 and 5

Option D: 5 and 7

Option E: 7 and 9

Ex Output:
Option C