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: 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: 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
Example Output: A

Example Input: Fact1: water vapor cooling causes that water vapor to condense, Fact2: Water is made up of H2O molecules., Question: what type of vapor cooling causes that vapor to condense? (A) Dew (B) CO 2 (C) CFCs (D) rain (E) SO2 (F) H20 (G) NaCl (H) h2o
Example Output:
H