Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

Ex Input:
Problem: if 8 men or 12 women can do a piece of work in 30 days, in how many days can the same work be done by 6 men and 11 women ?
Options: a. 10 days, b. 11 days, c. 13 days, d. 15 days, e. 18 days

Ex Output:
e


Ex Input:
Problem: the length of a rectangular floor is more than its breadth by 100 %. if rs. 600 is required to paint the floor at the rate of rs. 3 per sq m, then what would be the length of the floor ?
Options: a. 15.0 m., b. 14.4 m., c. 12.0 m., d. 16.2 m., e. 16.5 m.

Ex Output:
b


Ex Input:
Problem: right triangle xyzs the base of the prism in the figure above. if xy = xz = â ˆ š 9 and the height of the prism is 6, what is the volume of the prism ?
Options: ['a. 3', 'b. 27', 'c. 13', 'd. 12', 'e. 15']

Ex Output:

b