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: Molecules of tRNA bring amino acids to the ribosome in the correct sequence., Fact2: Ribosomes are sites of protein synthesis., Question: Molecules of _ initiate protein synthesis (A) Acids (B) nektar (C) sugar (D) tRNA (E) H 2 O (F) three (G) CO 2 (H) HIV
Example Output: D

Example Input: Fact1: when a metal rusts , that metal becomes orange on the surface, Fact2: Iron rusts in the presence of oxygen and water., Question: Exposure to oxygen and water can cause iron to (A) decrease strength (B) melt (C) uncontrollable burning (D) thermal expansion (E) turn orange on the surface (F) vibrate (G) Extremes of temperature (H) levitate
Example Output: E

Example Input: Fact1: Any surface that has not been sterilized is likely to be covered with bacteria., Fact2: Clean, sterilized contacts are less likely to breed bacteria., Question: What reduces bacteria on a surface? (A) sterilizing (B) amebiasis (C) antigens (D) plastic (E) changes in size (F) cartilage (G) a barometer (H) fluoride
Example Output:
A