Definition: 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").
Input: Fact1: a greenhouse is used to protect plants by keeping them warm, Fact2: Hobby greenhouses used to be small glass houses or fiberglass buildings., Question: Glass or fiberglass buildings are used to protect plants by keeping them what? (A) mild (B) heat (C) hibernating (D) cooled (E) warm (F) warmth (G) cold (H) frozen
Output:
E