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: nuclear reactions in stars causes stars to produce light, Fact2: And, of course, the Sun is a star., Question: What in the sun causes the sun to produce light? (A) energy of moving objects (B) hydrogen and oxygen (C) heat energy (D) water (E) solar rays (F) rotation (G) nuclear reactions (H) kinetic energy
Example Output: G

Example Input: Fact1: Biomass is the total mass of organisms at a trophic level., Fact2: Each stage is a trophic level., Question: The total mass of organisms in an environmental stage is called what? (A) food pyramid (B) extinction (C) ecological pyramid (D) food chain (E) vegetation (F) food (G) ligt (H) biomass
Example Output: H

Example Input: Fact1: wind is used for producing electricity, Fact2: Wind is air in motion., Question: what is used for producing electricity? (A) chemical reaction (B) hydrogen and oxygen (C) boiling oxygen (D) air in motion (E) kinetic energy (F) a hydraulic system (G) condensing water (H) clouds
Example Output:
D