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: soil is formed by rocks eroding, Fact2: Rivers erode the rocks they flow over., Question: What is formed by rivers? (A) fish (B) soil (C) rain (D) bamboo (E) spring (F) clouds (G) kayaks (H) NaCl
Example Output: B

Example Input: Fact1: plant requires seed dispersal for reproduction, Fact2: Reproductive investment was measured as seed mass, samara size, and dispersal ability., Question: What requires investment, seed mass, size and dispersal? (A) plants (B) Species (C) animals (D) coral (E) Oak (F) gene flow (G) Frogs (H) mussels
Example Output: A

Example Input: Fact1: a light bulb requires electrical energy to produce light, Fact2: Black numbers on a white background are easier to see in darkness or bright light., Question: Bulbs produce electrical energy to what? (A) reproduce (B) Change colors (C) rain or sun shine (D) adding heat (E) look at the sun (F) power up cars (G) see in darkness (H) walk through yards
Example Output:
G