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 rectangular plot measuring 90 metres by 50 metres is to be enclosed by wire fencing. If the poles of the fence are kept 10 metres apart, how many poles will be needed ?

 Option A: 28

 Option B: 56

 Option C: 57

 Option D: 58

 Option E: None of these
Example Output: Option A

Example Input: Question: Let f(x) = x^2 + bx + c. If f(1) = 0 and f(-8) = 0, then f(x) crosses the y-axis at what y-coordinate?

 Option A: -8

 Option B: -1

 Option C: 0

 Option D: 1

 Option E: 8
Example Output: Option A

Example Input: Question: The average of 9 observations was 4, that of the 1st of 5 being 10 and that of the last 5 being 8. What was the 5th observation?

 Option A: 54

 Option B: 12

 Option C: 15

 Option D: 17

 Option E: 18
Example Output:
Option A