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: What is the rate percent when the simple interest on Rs.800 amount to Rs.160 in 4 Years?

 Option A: 5%

 Option B: 6%

 Option C: 2%

 Option D: 95%

 Option E: 1%
Example Output: Option A

Example Input: Question: A man can row a boat at 20 kmph in still water. If the speed of the stream is 6 kmph, what is the time taken to row a distance of 66 km downstream?

 Option A: 30/83 hours

 Option B: 33/13 hours

 Option C: 31/13 hours

 Option D: 30/13 hours

 Option E: 30/14 hours
Example Output: Option B

Example Input: Question: If difference between compound interest and simple interest on a sum at 10% P.a. for 2 years is Rs.41 then sum is

 Option A: s.5000

 Option B: s.5100

 Option C: s.5800

 Option D: s.6000

 Option E: s.4100
Example Output:
Option E