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: blowing air into a whistle causes air to vibrate inside the whistle, Fact2: An ocarina is a multiple-tone whistle., Question: What happens to the air inside an ocarina when you blow into it? (A) It expands (B) evaporation (C) moves (D) waves (E) Temperature (F) vibrates (G) It decreases (H) friction
Output:
F