Q: 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").
Fact1: an animal requires warmth for survival, Fact2: Heat is produced to maintain warmth in the boy., Question: an animal requires what by the body for survival (A) stamina (B) heat energy (C) energy adaptors (D) heat produced (E) glycogen (F) chemical messengers (G) heat eaters (H) cool breeze
A:
D