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.

Ex Input:
Question: From a Group of 10 People, Including George and Nina, 3 people are to be selected at random to work on a certain project. What is the probability that 3 people selected will include George but not Nina

Option A: 5/56

Option B: 9/56

Option C: 28/120

Option D: 21/56

Option E: 25/56

Ex Output:
Option C

Ex Input:
Question: In a school of 450 boys, 44% of Muslims, 28% Hindus, 10% Sikhs and the remaining of other communities. How many belonged to the other communities?

Option A: 72

Option B: 75

Option C: 80

Option D: 81

Option E: 90

Ex Output:
Option D

Ex Input:
Question: David completes a piece of work in 5 days, John completes the same work in 9 days. If both of them work together, then the number of days required to complete the work is?

Option A: 3.2 days

Option B: 8 days

Option C: 10 days

Option D: 12 days

Option E: 14 days

Ex Output:
Option A