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: sakshi can do a piece of work in 5 days. tanya is 25 % more efficient than sakshi. the number of days taken by tanya to do the same piece of work :
Options: a. 4, b. 16, c. 18, d. 25, e. 10

Ex Output:
a


Ex Input:
Problem: a gardener grows cabbages in her garden that is in the shape of a square. each cabbage takes 1 square feet of area in her garden. this year, she has increased her output by 193 cabbages as compared to last year. the shape of the area used for growing the cabbages has remained a square in both these years. how many cabbages did she produce this year ?
Options: a. 8,208, b. 9,409, c. 11,424, d. 12,586, e. can not be determined

Ex Output:
b


Ex Input:
Problem: a farmer with 1,350 acres of land had planted his fields with corn, sugar cane, and tobacco in the ratio of 5: 2: 2, respectively, but he wanted to make more money, so he shifted the ratio to 2: 3: 4, respectively. how many more acres of land were planted with tobacco under the new system ?
Options: a. 75, b. 150, c. 300, d. 450, e. 600

Ex Output:

c