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.

Input: Consider Input: Problem: if the sides of a triangle are 26 cm, 24 cm and 15 cm, what is its area ?
Options: a. 120, b. 772, c. 180, d. 266, e. 2848

Output: c


Input: Consider Input: Problem: the l. c. m of two numbers is 495 and their h. c. f is 5. if the sum of the numbers is 100, then their difference is
Options: a. 19, b. 10, c. 28, d. 27, e. 29

Output: b


Input: Consider Input: Problem: excluding stoppages, the speed of a train is 45 kmph and including stoppages it is 30 kmph. of how many minutes does the train stop per hour ?
Options: a. a. 5, b. b. 10, c. c. 20, d. d. 30, e. e. 40


Output: c