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 can also generate little bursts of heat by shivering., Fact2: Basically, heat is energy., Question: What can a mammal produce by shivering? (A) energy (B) motion (C) food (D) warmth (E) cells (F) fur (G) light (H) matter
Output:
A