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: a and b invests rs. 2500 and rs. 4000 respectively in a business. if a doubles his capital after 6 months. in what ratio should a and b divide that year ' s profit ?
Options: a. 11: 5, b. 15: 16, c. 15: 2, d. 9: 9, e. 11: 1

Ex Output:
b


Ex Input:
Problem: ravi purchased a refrigerator and a mobile phone for rs. 15000 and rs. 8000 respectively. he sold the refrigerator at a loss of 5 percent and the mobile phone at a profit of 10 percent. overall he make a.
Options: a. 50, b. 288, c. 27, d. 200, e. 881

Ex Output:
a


Ex Input:
Problem: jansi went out for shopping. she had in her handbag approximately rs. 15 / - in one rupee notes and 20 p. coins. when she returned she had as many one rupee notes as she originally had and as many 20 p. coins as she originally had one rupee notes. she actually came back with about one - third of what she had started out with. how much did she spend and exactly how much did she have with her when she started out ?
Options: a. 9.6, b. 10.6, c. 11.0, d. 9.4, e. 8.1

Ex Output:

a