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: Echinoderms have a unique water vascular system with tube feet., Fact2: All echinoderms are deuterostomes ., Question: What can have a water vascular system with tube feet? (A) ducks (B) peachleaf willow (C) cats (D) orchids (E) Most plants (F) horses (G) animals (H) deuterostomes
A:
H