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").
Q: Fact1: Hair is a fiber that is found only in mammals., Fact2: Hair grows from a hair bulb under the skin., Question: A fiber found only in mammals grows from a bulb under what? (A) fur and fat (B) the mammal (C) light energy (D) the skin (E) the pelt (F) the animal (G) a cuticle (H) Exfoliation
A:
D