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 greenhouse is used to protect plants by keeping them warm, Fact2: Flower size varies by plant., Question: How does a greenhouse protect flowers? (A) keeps them away from the sun (B) keeps them warm (C) keeps them out of soil (D) an external framework (E) it needs them (F) keeps them cold (G) rays or beams (H) by indirect light
Example Output: B

Example Input: Fact1: melting is when solids are heated above their melting point, Fact2: Ice cubes melt in liquid water., Question: What, when heated, turns into liquid water? (A) gasoline (B) oil (C) a solute (D) fire (E) ice cubes (F) a prism (G) mussels (H) Energy.
Example Output: E

Example Input: Fact1: when a metal rusts , that metal becomes orange on the surface, Fact2: Moisture is the main cause of rust., Question: Moisture can turn metal what color (A) orange (B) damaging (C) solid (D) erosion (E) smooth (F) nectarine (G) mineral (H) Unsafe
Example Output:
A