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: the moon revolving around the Earth causes the phases of the moon, Fact2: Phases of the Moon are caused by a shadow from the Earth., Question: What does the light on the moon come from? (A) The Earth (B) a prism (C) The sun. (D) A shadow (E) heat (F) heat energy (G) Solar energy (H) The moon
Output:
C