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: Sponges have specialized cells called collar cells., Fact2: Collar cells produce a constant flow of water into the sponge., Question: Sponges have specialized work horse that produce a constant flow of what to the sponge? (A) cells (B) mucus (C) oxygen (D) lymph (E) water (F) Sperm (G) tissue (H) Blood
A:
E