Instructions: 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").
Input: Fact1: Cells secrete acids and bases to maintain the proper pH for enzymes to work., Fact2: Enzymes help to break down proteins so that the bacteria can do their thing better., Question: Why do cells secrete acids? (A) Make money (B) resistance activities (C) allow growth (D) Plant growth is reduced (E) Break down proteins (F) Hurt things (G) increases a body's strength (H) Help friends
Output:
E