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 x + y = 260, x - y = 200, for integers of x and y, y = ?
Options: a. 200, b. 230, c. 50, d. 115, e. 150

Output: b


Input: Consider Input: Problem: at what price must an article costing rs. 47.50 be marked in order that after deducting 7 % from the list price. it may be sold at a profit of 25 % on the cost price ?
Options: a. 63.84, b. 62.6, c. 62.1, d. 62.7, e. 62.2

Output: a


Input: Consider Input: Problem: set # 1 = { a, b, c, d, e, f } set # 2 = { k, l, m, n, o, p } there are these two sets of letters, and you are going to pick exactly one letter from each set. what is the probability of picking at least one vowel ?
Options: a. 1 / 6, b. 1 / 3, c. 1 / 2, d. 2 / 3, e. 4 / 9


Output: e