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: Wings are part of the exoskeleton and attached to the thorax., Fact2: Insect wings are attached to the dorsal side of their thorax., Question: What side of an insect are wings attached to? (A) white (B) dorsal (C) protected (D) abdomen (E) elytra (F) three (G) strong (H) tail
Example Output: B

Example Input: Fact1: Cancer is a disease in which cells divide out of control., Fact2: Cancer is also caused by a mutation., Question: What can mutations lead to in which cells divide out of control? (A) Smoking (B) resistance (C) a disease (D) viruses (E) AIDS (F) bacteria (G) Leptospirosis (H) cigarettes
Example Output: C

Example Input: Fact1: Most carcinogens cause cancer by producing mutations in DNA., Fact2: Jet fuels are carcinogens., Question: What in an airplane can mutate organisms? (A) an anion (B) Damages them (C) Jet fuel (D) light energy (E) Toxicity (F) Allergies (G) kill them (H) heat
Example Output:
C