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").
Q: Fact1: Reptiles are a class of tetrapod vertebrates that produce amniotic eggs., Fact2: Crocodiles, snakes, and lizards are all types of reptiles., Question: What is an example of a tetrapod vertebrate? (A) genus (B) Leeuwenhoek (C) a fish (D) crocodile (E) animals (F) four limbs (G) warm-blooded (H) graptolites
A:
D