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.

Example Input: Problem: a man goes to shopkeeper and says that if u give me as much as i have, i will spend rs. 10 / - on ur shop. shopkeeper agrees and man moves to another shopkeeper ans asked same. at 3 rd shop after all the transaction, he was left with no money. find the initial amount with the man
Options: a. 5.75, b. 6.75, c. 7.75, d. 8.75, e. 9.75
Example Output: d

Example Input: Problem: in what ratio must a grocer mix two varieties of pulses costing rs. 15 and rs. 20 per kg respectively so as to get a mixture worth rs. 16.50 per kg ?
Options: a. 3: 7, b. 5: 7, c. 7: 3, d. 7: 5, e. none
Example Output: c

Example Input: Problem: at a certain organisation, the number of male members went up by 15 % in the year 2001 from year 2000, and the number of females members went down by 6 % in the same time period. if the total membership at the organisation went up by 1.2 % from the year 2000 to 2001, what was the ratio of male members to female members in the year 2000 ?
Options: a. 1: 2, b. 1: 3, c. 2: 3, d. 3: 2, e. 2: 1
Example Output:
a