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: skin is used for protecting the body from harmful substances, Fact2: Pollution is the release of harmful substances into the environment., Question: What does the skin protect against? (A) smallpox (B) A virus (C) disease (D) sun's heat (E) cancer (F) leukemia (G) Pollution (H) heat energy
G