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: what number must be added to 6, 16 and 8 to get an average of 13 ?
Options: a. 23, b. 22, c. 44, d. 33, e. 55

Ex Output:
b


Ex Input:
Problem: sandy walked 20 meters towards south. then sandy turned to her left and walked 20 meters. she then turned to her left and walked 20 meters. she then turned to her right and walked 25 meters. what distance is she from the starting point and in which direction ?
Options: a. 35 m east, b. 35 m north, c. 30 m west, d. 45 m west, e. 45 m east

Ex Output:
e


Ex Input:
Problem: john makes $ 60 a week from his job. he earns a raise andnow makes $ 78 a week. what is the % increase ?
Options: a. 16.12 %, b. 16.66 %, c. 30 %, d. 17.66 %, e. 18.1 %

Ex Output:

c