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: Most aquatic organisms do not have to deal with extremes of temperature or moisture., Fact2: Fish and other aquatic creatures are no exception., Question: What do most fish not have to deal with? (A) negative feedback (B) feedback mechanisms (C) Exposure to oxygen and water (D) the environment (E) Temperature extremes (F) protein foreign to the body. (G) antigens that cause allergy (H) Warmer temperatures
A:
E