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: matter vibrating can cause sound, Fact2: All matter emits vibrations., Question: What kind of matter can produce sound? (A) sensory neurons (B) all matter (C) an object (D) only liquids (E) mechanical (F) only plasma (G) only solids (H) waves
Example Output: B

Example Input: Fact1: Some parasites kill their host, but most do not., Fact2: Parasites include lungworms and GI parasites., Question: What can kill their host? (A) cigarettes (B) bacteria (C) adding heat (D) heat or cold (E) burning (F) Dehydration (G) lungworms (H) Pollution
Example Output: G

Example Input: Fact1: Most invertebrates have a nervous system., Fact2: Invertebrates are animals without a backbone., Question: Which type of system do most animals without backbones have? (A) sensory neurons (B) Veins and arteries. (C) Nervous system (D) Stereo system (E) Root system (F) to move people (G) Skeletal system (H) insects
Example Output:
C