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: the emission of sulfur dioxide causes acid rain, Fact2: The sulfur dioxide is converted into sulfuric acid., Question: what causes acid rain? (A) gases (B) rainfall (C) Pollution (D) fossil fuels (E) emissions (F) vehicles (G) burning (H) wind
Example Output: E

Example Input: Fact1: tidal energy can be used to produce electricity, Fact2: Tidal caves are formed by the energy of the rising and falling tides., Question: what can produce electricity? (A) rivers (B) animal transport (C) tidal caves (D) Nematoda (E) rays or beams (F) animals (G) cactuses (H) photons
Example Output: C

Example Input: Fact1: Macroevolution is evolution over geologic time above the level of the species., Fact2: Species consist of groups of interbreeding populations., Question: Macroevolution is evolution over what time scale above the level of interbreeding populations? (A) ligt (B) relocation (C) minutes (D) graptolites (E) Most plants (F) geologic (G) standard clock (H) 24-hour
Example Output:
F