Instructions: 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").
Input: Fact1: if gas is heated then that gas will expand, Fact2: If a material is heated, it expands and the density decreases., Question: When does a gas's density decrease? (A) Time and energy (B) cool off (C) Dehydration (D) air cools (E) It becomes dormant (F) Evaporation (G) Dilution (H) When it's heated
Output:
H