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.

Example Input: Question: A train 125m long takes 6 sec to cross a man walking at 5kmph in a direction opposite to that of the train. Find the speed of the train?

 Option A: 65kmph

 Option B: 70kmph

 Option C: 75kmph

 Option D: 80kmph

 Option E: 85kmph
Example Output: Option B

Example Input: Question: What is the sum of all the numbers which divides 100 ?

 Option A: 408

 Option B: 102

 Option C: 816

 Option D: 916

 Option E: 416
Example Output: Option A

Example Input: Question: The product of n consecutive positive integers is always divisible by?

 Option A: n^2 -1

 Option B: (n+1

 Option C: 2n +1

 Option D: n^2 + 1

 Option E: n!
Example Output:
Option D