Instructions: 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 from the cold, Fact2: The air in the greenhouse is humid., Question: What are two things that are important for plants? (A) organic material (B) Bubbles and soap (C) Humidity and protection (D) excretory structures (E) Sand and rocks (F) Darkness and cool winds (G) food and shelter (H) genetic diversity
Output:
C