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: The greatest number that divides 180, 565 and 705 leaving remainder 5, 5 and 5 respectively is:

 Option A: 31

 Option B: 33

 Option C: 35

 Option D: 38

 Option E: 39
Example Output: Option C

Example Input: Question: One-tenth of the students at a nursery school are 4 years old or older. If 20 students have not yet reached their third birthday, and a total of 50 students are not between 3 years old and 4 years old, how many children are in the nursery school?

 Option A: 150

 Option B: 300

 Option C: 450

 Option D: 490

 Option E: 620
Example Output: Option B

Example Input: Question: A began business with 12500 and is joined afterwards by B with 75000. When did B join, if the profits at the end of the year are divided equally?

 Option A: 8 months

 Option B: 9 months

 Option C: 10 months

 Option D: 7 months

 Option E: None of these
Example Output:
Option C