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").
Input: Fact1: Amphibians have a relatively complex circulatory system with a three-chambered heart., Fact2: Frogs, toads and salamanders are amphibians., Question: Which animal has a circulatory system with a three-chambered heart? (A) animals (B) Salamander (C) fur seals (D) mammals (E) alpacas (F) a fish (G) warm-blooded (H) barnacles
Output:
B