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: Vertebrate chordates have a backbone., Fact2: Invertebrates have no vertebrae or backbone., Question: What kind of animal is classified as having a vertebrae? (A) it keeps an organism warm (B) invertebrate (C) vertebrate chordate (D) gastropod shells (E) the body's largest organ (F) remains of prehistoric life (G) hard boned animals (H) roundworm
Output:
C