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 Q]: Question: If the number 5 * 2 is divisible by 6, then * = ?

Option A: 2

Option B: 5

Option C: 3

Option D: 1

Option E: 6
[EX A]: Option A

[EX Q]: Question: A certain number of workers can do a work in 85 days. If there were 10 workers more it could be finished in 10 days less. How many workers are there?

Option A: 75

Option B: 30

Option C: 28

Option D: 24

Option E: 32
[EX A]: Option A

[EX Q]: Question: The sum of the present ages of father and his son is 60 years. Six years ago, father's age was five times the age of the son. After 6 years, son's age will be?

Option A: 27 years

Option B: 28 years

Option C: 29 years

Option D: 20 years

Option E: 17 years
[EX A]:
Option D