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: a breathing mask is used for keeping harmful particles from entering the respiratory system, Fact2: Aerosols are tiny particles suspended in the air., Question: What can be used for keeping aerosols from entering the respiratory system? (A) goggles (B) hydration (C) sweating (D) hydrogen and oxygen (E) breathing masks (F) lab coats (G) layers of fat (H) gloves
A:
E