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: If x persons take y days to complete z similar jobs, how long does it take y persons to complete 1 such job?

 Option A: z

 Option B: x

 Option C: x/y

 Option D: z/x

 Option E: x/z
Example Output: Option E

Example Input: Question: Triangle STV has sides ST = TV = 26, and SV = 20. What is the area?

 Option A: 160

 Option B: 180

 Option C: 200

 Option D: 220

 Option E: 240
Example Output: Option E

Example Input: Question: In how many years will a sum of money doubles itself at 5% per annum simple interest

 Option A: 25 years

 Option B: 28 years

 Option C: 10 years

 Option D: 20 years

 Option E: 21 years
Example Output:
Option D