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: when jessica withdrew $ 200 from her bank account, her account balance decreased by 2 / 5. if she deposits an amount equal to 2 / 3 of the remaining balance, what will be the final balance in her bank account ?
Options: a. 300, b. 375, c. 400, d. 500, e. 575

Ex Output:
d

Ex Input:
Problem: a shopkeeper sold 30 articles at the cost price of 35 articles. then find the profit % or lost %
Options: a. 12 %, b. 15 %, c. 16.67 %, d. 18 %, e. 22 %

Ex Output:
c

Ex Input:
Problem: if the cost price of 50 articles is equal to the selling price of 40 articles, then the gain or loss percent is ?
Options: a. 33 %, b. 29 %, c. 25 %, d. 55 %, e. 39 %

Ex Output:
c