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: Streams may start with runoff or water seeping out of a spring., Fact2: Streams A stream is a sequence of characters., Question: a sequence of characters may start with runoff or what seeping out of a spring? (A) sodium (B) Joules (C) liquid (D) rivers (E) solutes (F) water (G) rain (H) SO2
Example Output: F

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: gases from burning coal and oil dissolving in water in the atmosphere causes acid rain, Fact2: Coal-fired power plants contribute to acid rain., Question: what can power plants cause? (A) Pesticides (B) wind (C) heat energy (D) acid rain (E) friction (F) Pollution (G) coal (H) oil
Example Output:
D