Definition: In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Input: Fact1: fat is used to keep animals warm, Fact2: Food turns into fat., Question: What do animals need to keep warm? (A) a blanket (B) lipids (C) grass (D) fur (E) wings (F) food (G) a space heater (H) Energy
Output:
F