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: All life relies on a relatively narrow range of pH, or acidity., Fact2: All organisms have life cycles., Question: what relies on a relatively narrow range of acidity? (A) organisms (B) carbon (C) animals (D) hydrogen (E) density (F) trees (G) Most plants (H) barnacles
Example Output: A

Example Input: Fact1: astronauts require preserved food for extended flights, Fact2: An astronaut is a scientist who is a space explorer., Question: Space explorers require preserved foods for (A) ground training (B) nutrients (C) Dehydration (D) survival (E) long flights (F) short flights (G) Special disposal (H) day trips
Example Output: E

Example Input: Fact1: the vanes rotating in an electric fan causes air to move, Fact2: Air molecules move slowly when they are cool., Question: Vanes rotating in an electric fan causes air molecules to what? (A) cool (B) heat (C) Slow. (D) slow (E) fly (F) Move (G) expand (H) motion
Example Output:
A