Q: 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: Mammals generate heat mainly by keeping their metabolic rate high., Fact2: Birds have a high metabolic rate and a high energy requirement., Question: What mammals have a high energy requirement and generate heat? (A) cats (B) bats (C) Crustaceans (D) bears (E) frogs (F) lizards (G) birds (H) mammals
A:
G