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 pump can fill a tank with water in 2 hours. Because of a leak, it took 2 1/6 hours to fill the tank. The leak can drain all the water of the tank in?

 Option A: 17 hr

 Option B: 19 hr

 Option C: 10 hr

 Option D: 24 hr

 Option E: 26 hr
Example Output: Option E

Example Input: Question: For positive integers x and z, which of the following can be written as z^2?

 Option A: x^2+1

 Option B: x^2-1

 Option C: x^2-24

 Option D: x^2+11

 Option E: x^2-11
Example Output: Option D

Example Input: Question: A completes a work in 6 days and B complete the same work in 24 days. If both of them work together, then the number of days required to complete the work will be

 Option A: 8 days

 Option B: 9 days

 Option C: 10 days

 Option D: 4.8 days

 Option E: 13 days
Example Output:
Option D