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 Fish are the ultimate aquatic organism., Question: the ultimate aquatic organism has a circulatory system with a how many chambered heart.? (A) ligt (B) moss (C) Frog (D) tube (E) clam (F) two (G) size (H) Aves
A:
F