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: P can do a work in 24 days. Q can do the samework in 9 days & R can do the same work in 12 days. Q & R start the work and leave after 3 days. P finishes the remaining work in how many days.

Option A: 8

Option B: 10

Option C: 14

Option D: 16

Option E: 19

Ex Output:
Option B

Ex Input:
Question: One water pump can fill half of a certain empty tank in 7 hours. Another pump can fill half of the same tank in 7.5 hours. Working together, how long will it take these two pumps to fill the entire tank?

Option A: 7 7/13

Option B: 1 5/8

Option C: 3 1/4

Option D: 7 7/29

Option E: 3 1/2

Ex Output:
Option D

Ex Input:
Question: A palindrome is a number that reads the same forward and backward, such as 171. How many even, 6-digit numbers are palindromes?

Option A: 405

Option B: 450

Option C: 400

Option D: 900

Option E: 2500

Ex Output:
Option C