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: find the value of 1 / ( 3 + 1 / ( 3 + 1 / ( 3 - 1 / 3 ) ) )
Options: a. 21 / 29, b. 27 / 89, c. 89 / 21, d. 29 / 21, e. none

Output: b


Input: Consider Input: Problem: a fruit - salad mixture consists of apples, peaches, and grapes in the ratio 6: 5: 4, respectively, by weight. if 60 pounds of the mixture is prepared, the mixture includes how many more pounds of apples than grapes ?
Options: a. 15, b. 12, c. 8, d. 6, e. 4

Output: c


Input: Consider Input: Problem: teas worth rs. 126 per kg and rs. 135 per kg are mixed with a third variety in the ratio 1: 1: 2. if the mixture is worth rs 153 per kg, the price of the third variety per kg will be ?
Options: a. rs. 147.50, b. rs. 785.50, c. rs. 175.50, d. rs. 258.50, e. none of these


Output: c