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: a plant requires sunlight for photosynthesis, Fact2: Photosynthesis is the process of making food., Question: What do plants require to make food? (A) nutrients (B) sunlight (C) photons (D) Energy. (E) Light (F) Proteins (G) power (H) heat energy
Example Output: B

Example Input: Fact1: Molecules of DNA are encoded with instructions that tell cells what to do., Fact2: Genes, made of DNA, carry the instructions for building proteins., Question: what do genes carry? (A) pollen (B) Energy (C) calories (D) instructions (E) Chemical energy (F) fat (G) acid (H) colors
Example Output: D

Example Input: Fact1: when light enters the eye through the pupil , that light falls on the retina, Fact2: Humans use both eyes to see a single image., Question: What do humans use to see an image? (A) keratin (B) light (C) heat (D) fibers (E) calcite (F) mussels (G) photons (H) Neuron.
Example Output:
B