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: Sperm had to swim from male to female reproductive organs for fertilization., Fact2: Gametes, the sperm and eggs, are produced by mitosis in the haploid gametophyte., Question: What swims from male to female reproductive organs for fertilization? (A) gametes (B) barnacles (C) fur seals (D) eggs (E) offspring (F) haploid (G) seeds (H) diploid
Example Output: A

Example Input: Fact1: natural disasters can cause animals to leave an environment, Fact2: And like fire, flooding is a common and widespread natural disaster., Question: What can cause animals to leave their environment? (A) predators (B) rainfall (C) space travel (D) flooding (E) drought (F) mines (G) wind (H) weather
Example Output: D

Example Input: Fact1: Caffeine is a central nervous system stimulant., Fact2: Caffeine is a stimulant, and a stimulant constricts blood vessels., Question: What does caffeine do to blood vessels? (A) It expands (B) looseness (C) hydrate their cells (D) Constrict them (E) sweating (F) Dehydration (G) They may not survive. (H) Damages them
Example Output:
D