Given the task definition and input, reply with output. 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: Echinoderms lack respiratory and excretory systems., Fact2: Starfish and sea urchins are also echinoderms., Question: What is an example of an animal that lacks a respiratory and excretory system? (A) Dog (B) Human (C) alpacas (D) cacti (E) Starfish (F) Leeuwenhoek (G) Elephants (H) cows
E