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: A reduction of 20% in the price of salt enables a lady to obtain 25 kgs more for Rs.100, find the original price per kg?

 Option A: 6

 Option B: 1

 Option C: 5

 Option D: 4

 Option E: 7
Example Output: Option B

Example Input: Question: What is the next number of the following sequence
10, 7, 12, 10, 14, __ ?

 Option A: 13

 Option B: 14

 Option C: 15

 Option D: 16

 Option E: 17
Example Output: Option A

Example Input: Question: If 4/(a - 5) = 5/(a + 5), then a = ?

 Option A: 40

 Option B: 45

 Option C: 35

 Option D: 55

 Option E: 50
Example Output:
Option B