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 certain roller coaster has 6 cars, and a passenger is equally likely to ride in any 1 of the 6 cars each time that passenger rides the roller coaster. if a certain passenger is to ride the roller coaster 6 times, what is the probability that the passenger will ride in each of the 6 cars ?
Options: a. 3 / 1944, b. 1 / 96, c. 2 / 96, d. 1 / 1944, e. 1

Ex Output:
a


Ex 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

Ex Output:
d


Ex Input:
Problem: a gambler bought $ 5,000 worth of chips at a casino in denominations of $ 20 and $ 100. that evening, the gambler lost 16 chips, and then cashed in the remainder. if the number of $ 20 chips lost was 2 more or 2 less than the number of $ 100 chips lost, what is the largest amount of money that the gambler could have received back ?
Options: a. $ 4,040, b. $ 4,120, c. $ 1,960, d. $ 4,920, e. $ 1,400

Ex Output:

b