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: man buys an article for 10% less than its value and sells it for 10% more than its value. His gain or loss percent is?

 Option A: 12

 Option B: 76

 Option C: 26

 Option D: 20

 Option E: 12

Ex Output:
Option D


Ex Input:
Question: If 3^x*4^y = 1,594,323 and x – y = 13, then x = ?

 Option A: 10

 Option B: 11

 Option C: 12

 Option D: 13

 Option E: 14

Ex Output:
Option D


Ex Input:
Question: Rajeev' age after 15 years will be 5 times his age 5 years back . What is the present age of Rajeev ?

 Option A: 8 years

 Option B: 10 years

 Option C: 12 years

 Option D: 14 years

 Option E: 16 years

Ex Output:

Option B