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 Q]: Problem: a shopkeeper sells 500 metres of cloth for rs. 18000 at a loss of rs. 5 per metre. find his cost price for one metre of cloth ?
Options: a. 12, b. 27, c. 29, d. 50, e. 41
[EX A]: e

[EX Q]: Problem: what is the probability of getting a queen or spade from a set of cards ?
Options: a. 3 / 13, b. 4 / 13, c. 5 / 13, d. 6 / 13, e. 7 / 13
[EX A]: b

[EX Q]: Problem: a man have 8 t - shirt and some pant. he can dress in 72 ways. then tell me the no. of pant that man have.
Options: a. 8, b. 9, c. 10, d. 11, e. 12
[EX A]:
b