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: sound can be used for communication by animals, Fact2: Barking is a dog's way of communicating., Question: What is a dog's sound? (A) whisper (B) Social (C) meow (D) yell (E) struck (F) unique (G) bark (H) sound
Output:
G