You will be given a definition of a task first, then some input of the task.
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: Cells secrete acids and bases to maintain the proper pH for enzymes to work., Fact2: Acids and bases are electrolytes., Question: What do cells secrete to maintain the proper pH for enzymes to work? (A) Energy (B) Chemical energy (C) water conservation (D) sweating (E) heat energy (F) aqueous solution (G) Organic compounds (H) electrolytes
Output:
H