In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

Input: Consider Input: Which of the following most likely led to certain rocks having less friction? (A) a babbling brook (B) people (C) a light wind (D) money

Output: A


Input: Consider Input: A source of heat may come from (A) a cold shower (B) holding hands (C) holding ice (D) Antartica

Output: B


Input: Consider Input: Deer often live near (A) lions (B) crocodiles (C) log cabins (D) polar bears


Output: C