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").

Example Input: Fact1: heat can change the state of matter, Fact2: Matter exists in a solid, liquid or gas state and can change forms., Question: _ can change liquid to gas. (A) magnetism (B) cycles (C) energy (D) vapors (E) condensation (F) gravity (G) thirst (H) Heat
Example Output: H

Example Input: Fact1: Viruses cause many human diseases., Fact2: Examples include influenza, rabies, HIV, and Herpes viruses., Question: What causes human disease? (A) HPV (B) UV (C) minerals (D) Tamiflu (E) mold (F) HIV (G) human growth (H) CFCs
Example Output: F

Example Input: Fact1: when a metal rusts , that metal becomes orange on the surface, Fact2: Metal turns to rust via oxidation., Question: what makes metal orange? (A) pigmentation (B) heating (C) tubular organ (D) antigens (E) chondrocytes (F) radiation (G) oxidation (H) several genes
Example Output:
G