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: Fish have a circulatory system with a two-chambered heart., Fact2: Fish species include salmon and trout., Question: What has circulatory system with a two-chambered heart? (A) sharks (B) trout (C) pan (D) toads (E) Birds (F) animals (G) mammals (H) Man
A:
B