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: friction is used for stopping a vehicle by brakes, Fact2: Friction produces heat., Question: Stopping a car by applying the brakes will generate (A) gas (B) danger (C) damage (D) death (E) 86400 (F) heat (G) wind (H) fluid
A:
F