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").

Ex Input:
Fact1: seeing requires light, Fact2: Vision is our ability to see., Question: What is required for vision? (A) light (B) goggles (C) food (D) smell (E) hormones (F) Protein (G) color (H) hue

Ex Output:
A

Ex Input:
Fact1: Many consumers feed at more than one trophic level., Fact2: Consumers are heterotrophs that feed on tissues of other organisms., Question: What may eat other organisms at more than one trophic level? (A) barnacles (B) chickens (C) fur seals (D) humans (E) heterotrophs (F) mammals (G) animals (H) rabbit

Ex Output:
E

Ex Input:
Fact1: harming an animal species causes that animal 's population to decrease, Fact2: Today, the pink flamingo is included on the endangered species list., Question: What causes pink flamingos' population to decrease? (A) replenishing their habitats (B) drought (C) harming them (D) hypothyroidism (E) helping them (F) influenza (G) feeding them (H) Pesticides

Ex Output:
C