Instructions: 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: Mammals conserve body heat with their hair or fur., Fact2: Body heat is trapped in the haircoat., Question: What do mammals use to conserve heat? (A) energy (B) Energy. (C) fur and fat (D) blood (E) haircoat (F) food (G) body water (H) tail
Output:
E