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 light bulb is used for seeing in the dark, Fact2: Light is emitted by a light bulb., Question: What is required for seeing? (A) dark (B) sun (C) light (D) wind (E) retina (F) eyes (G) photons (H) copper
Example Output: C

Example Input: Fact1: Genes that are located on the same chromosome are called linked genes., Fact2: Linked genes are inherited together., Question: Genes are inherited together if they are located on the same what? (A) the eyes (B) chromosome (C) cell (D) gene (E) pollen (F) sensory neurons (G) DNA (H) Most plants
Example Output: B

Example Input: Fact1: when a plant grows , the size of the leaves of that plant may increase, Fact2: Leaves help carry on photosynthesis., Question: As a plant grows, what increases? (A) photosynthesis (B) soil (C) minerals (D) nutrients (E) genetic diversity (F) Quality of life (G) gene flow (H) gold
Example Output:
A