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: 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
Example Output: c

Example Input: Problem: an industrial loom weaves 0.128 metres of cloth every second. approximately, how many seconds will it take for the loom to weave 25 metre of cloth ?
Options: a. 194 seconds, b. 195 seconds, c. 196 seconds, d. 197 seconds, e. none of these
Example Output: b

Example Input: Problem: aishwarya rai walks into a bank to cash out her check. by mistake the bank teller gives her dollar amount in change, and her cent amount in dollars. on the way home she spends 5 cent, and then suddenly she notices that she has twice the amount of her check. how much was her check amount ?
Options: a. 21.55, b. 25.89, c. 30.56, d. 31.55, e. 31.63
Example Output:
e