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: Evolution occurs in response to a change in the environment., Fact2: Extinction is a natural part or the process of evolution., Question: What happens to an environment to cause extinction?  (A) relocation (B) changes (C) rain (D) exposure (E) forces (F) wind (G) Pollution (H) discovery
Example Output: B

Example Input: Fact1: when light enters the eye through the pupil , that light falls on the retina, Fact2: Images are retained on the retina of a viewer's eye for a fraction of a second after they strike it., Question: Where are images retained? (A) Retina (B) RNA (C) calcite (D) an object (E) arteries (F) energy (G) squids (H) segmented
Example Output: A

Example Input: Fact1: lack of moisture in the air causes low amounts of rainfall, Fact2: Humidity is moisture in the air., Question: What does a lack of humidity cause? (A) tornadoes (B) fires (C) low rainfall (D) disease (E) permineralization (F) drought (G) Dehydration (H) sweating
Example Output:
C