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: 23, 18, 16, 11, 9, 4 ?

 Option A: 3

 Option B: 2

 Option C: 7

 Option D: 5

 Option E: 1

Ex Output:
Option B


Ex Input:
Question: A is twice as fast as B. If B alone can do a piece of work in 18 days, in what time can A and B together complete the work?

 Option A: 10

 Option B: 16

 Option C: 18

 Option D: 6

 Option E: 12

Ex Output:
Option D


Ex Input:
Question: An error 1% in excess is made while measuring the side of a square. The percentage of error in the calculated area of the square is:

 Option A: 2.01

 Option B: 30.1

 Option C: 3.01

 Option D: 25.01

 Option E: 4.05

Ex Output:

Option A