You will be given a definition of a task first, then some input of the task.
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").

Fact1: hearing is used for sensing sound by animals, Fact2: Sound waves enter the ear, and are then amplified., Question: What uses ears to hear? (A) Stereos (B) humans (C) TVs (D) Animals (E) Mammal (F) organisms (G) pigeons (H) Plants
Output:
D