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: Two pipes A&B can fill a tank in 24 min and 32 min respectively. If both the pipes are opened simultaneously, after how much time B should be closed so that the tank is full in 18 min.

Option A: 8 min

Option B: 3 min

Option C: 21 min

Option D: 23 min

Option E: 24 min

Ex Output:
Option A

Ex Input:
Question: A man performs 3/5 of the total journey by rail, 17/20 by bus and the remaining 6.5 km on foot. His total journey is :

Option A: 125 km

Option B: 130 km

Option C: 135 km

Option D: 140 km

Option E: None

Ex Output:
Option B

Ex Input:
Question: A certain article of clothing was discounted during a special sale to 2/5 of its original retail price. When the clothing didn't sell, it was discounted even further to 1/2 of its original retail price during a second sale. By what percent did the price of this article of clothing decrease from the first sale to the second sale?

Option A: 50%

Option B: 33.33%

Option C: 25%

Option D: 16.66%

Option E: 12.5%

Ex Output:
Option D