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 flashlight requires a source of electricity to produce light, Fact2: Flashlights can help children see better., Question: Children see better with a source of electricity to do what? (A) focusing a lens (B) staying warm (C) survival (D) reproduce (E) produce light (F) remove electricity (G) produce darkness (H) remove light
Example Output: E

Example Input: Fact1: water causes refraction of light, Fact2: Halos are produced by the refraction of light., Question: What causes halos? (A) germs (B) Pacific (C) solutes (D) water (E) storms (F) glass (G) algae (H) the sun
Example Output: D

Example Input: Fact1: Chemical bonds form when substances react with one another., Fact2: All substances are composed of molecules., Question: What forms when molecules react with one another? (A) Chemical energy (B) substrates (C) chemical bonds (D) living things (E) Organic compounds (F) Energy. (G) new elements (H) flow of electrons
Example Output:
C