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: Mammals conserve body heat with their hair or fur., Fact2: Mammals generate the internal heat via metabolism., Question: what do animals make with metabolism? (A) fat (B) carbohydrates (C) heat (D) magma (E) sugar (F) food (G) energy (H) Acids
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
C