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: x% of y is y% of ?

 Option A: x

 Option B: 100x

 Option C: x/100

 Option D: y/100

 Option E: None
Example Output: Option A

Example Input: Question: In an electric circuit, two resistors with resistances x and y are connected in parallel. If R is the combined resistance of these two resistors, then the reciprocal of R is equal to the sum of the reciprocals of x and y. What is R if x is 5 Ohms and y is 7 Ohms?

 Option A: 3/5

 Option B: 1/7

 Option C: 12/35

 Option D: 31/12

 Option E: 35/12
Example Output: Option E

Example Input: Question: Out of four numbers ,the average of first three is 16 and that of the last three is 15. If the last number is 23,the first number is :

 Option A: 22

 Option B: 21

 Option C: 77

 Option D: 99

 Option E: 26
Example Output:
Option E