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

 Option A: 3

 Option B: 2

 Option C: 7

 Option D: 5

 Option E: 1
Example Output: Option B

Example Input: Question: Little John had $8.50. He spent $1.25 on sweets and gave to his two friends $1.20 and $2.20. How much money was left?

 Option A: $5.85

 Option B: $6.85

 Option C: $ 3.85

 Option D: $2.85

 Option E: $4.85
Example Output: Option C

Example Input: Question: In what ratio must rice at Rs.30 per kg mixed with rice at Rs.10.80 per kg so that the mixture be worth Rs.10per kg Ans

 Option A: 8:7

 Option B: 8:8

 Option C: 8:3

 Option D: 8:2

 Option E: 8:1
Example Output:
Option A