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: an animal needs to attract a mate to reproduce, Fact2: Animals mate because of smells., Question: What do animals use to reproduce? (A) tapeworms (B) glycogen (C) cellulose (D) smells (E) hormones (F) RNA (G) Echinoids (H) pollen
Output:
D