Detailed Instructions: 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: Vertebrates are all chordates that have a backbone., Fact2: Mammals are like other chordates in that they have backbones., Question: what are vertebrates? (A) jellyfish (B) bacteria (C) animals (D) Catch prey (E) humans (F) crocodiles (G) invertebrates (H) mammals
A:
H