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: electricity is used as an energy source by electrical devices, Fact2: Electrical fields result from electrical devices and televisions., Question: What is used as an energy source by television? (A) electricity (B) light (C) our nearest star (D) air (E) energy (F) satellites (G) photons (H) rocks
Example Output: A

Example Input: Fact1: Male dogs use pheromones in urine to mark their territory., Fact2: Pheromones are natural aphrodisiacs., Question: What do male dogs use in urine to mark their territory? (A) Natural aphrodisiacs (B) competing for resources (C) Tails (D) Urine  cleaner (E) Something coming from a gland (F) Chemical energy (G) an area swollen with pus (H) Chew toys
Example Output: A

Example Input: Fact1: Courtship is behavior that is intended to attract a mate., Fact2: Complex courtship rituals precede mating., Question: What are behavior that is intended to attract a mate? (A) a doorbell (B) firm hugs (C) Complex rituals (D) Riding a bike (E) Behaviour modifications (F) Magnets (G) honeybees (H) Friendship
Example Output:
C