Definition: 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").
Input: Fact1: Birds are endothermic tetrapod vertebrates., Fact2: Birds and mammals are endothermic., Question: what are endothermic? (A) bacteria (B) sharks (C) dinosaurs (D) organs (E) brains (F) animals (G) crocodiles (H) mammals
Output:
H