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: Hormones control many cell activities, so they are very important for homeostasis., Fact2: Homeostasis is the central theme of physiology., Question: what is hormones controlling cell activities important to? (A) gravity (B) it helps plants in growing (C) the sun (D) central theme of physiology (E) female sex cells (F) density (G) Generating heat (H) production of energy
A:
D