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: Some arthropods have special excretory structures., Fact2: All insects are arthropods., Question: what sometimes has special excretory structures? (A) insects (B) bees (C) a fish (D) barnacles (E) animals (F) carbon (G) feces (H) humans
Example Output: A

Example Input: Fact1: Most mollusks have shells., Fact2: All mollusks have soft bodies., Question: What can shells protect? (A) fronts (B) animals (C) soft bodies (D) coastlines (E) fur (F) blood (G) critical organs (H) hard bodies
Example Output: C

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 their urine to mark their territory? (A) feces (B) layers of fat (C) natural aphrodisiacs (D) food (E) Something coming from a gland (F) Chemical energy (G) cats (H) hydrocarbons
Example Output:
C