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: Mutualism is a symbiotic relationship in which both species benefit., Fact2: Dogs and humans are symbiotic species., Question: what exists between dogs and humans? (A) mutualism (B) gravity (C) communication (D) antigens (E) several genes (F) space between (G) electrons (H) german shepherd
Example Output: A

Example Input: Fact1: glass cause refraction of light, Fact2: Refraction Refraction is the bending of light rays., Question: Glass causes the _ of light (A) intensification (B) bending (C) photons (D) a wave (E) Pollution (F) blocking (G) heat (H) amplification
Example Output: B

Example Input: Fact1: poison causes harm to living things, Fact2: Rattlesnakes can inject poisonous venom., Question: What causes harm to living things? (A) toxins (B) HIV (C) Alcohol (D) food (E) A drug. (F) air (G) water (H) venom
Example Output:
H