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: Two trains, each 100 m long, moving in opposite directions, cross other in 6 sec. If one is moving twice as fast the other, then the speed of the faster train is?

Option A: 80 km/hr

Option B: 66 km/hr

Option C: 60 km/hr

Option D: 67 km/hr

Option E: 22 km/hr
Example Output: Option A

Example Input: Question: The area of a parallelogram is 72sq m and its altitude is twice the corresponding base. Then the length of the base is?

Option A: 6

Option B: 9

Option C: 7

Option D: 62

Option E: 2
Example Output: Option A

Example Input: Question: Person X joins a job at 20 yrs. First 3 years salary = 10,000 p.a. Afterwards every year increment of 2,000 per year for 10 years. Then salary becomes constant till retirement. At retirement average salary is 25,000. (throughout career). At what age he retires?

Option A: 50

Option B: 60

Option C: 40

Option D: 70

Option E: 80
Example Output:
Option A