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: a car engine usually converts gasoline into motion and heat through combustion, Fact2: Combustion is never complete in gasoline and diesel engines., Question: What do cars use gas to produce? (A) Pollution (B) Energy. (C) thrust (D) energy (E) glycogen (F) deadly (G) motion (H) heat
A:
G