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: Most mammals can be active even in cold weather because they are warm-blooded., Question: which can help warm-blooded animals stay active in cold? (A) shivering (B) four limbs (C) Animal fur (D) sleep (E) sweating (F) hibernation (G) cold blood (H) fur seals
Output:
A