What Is the Most Important Precaution to Teach a Patient

What is the most important precaution to teach a patient about anti-inflammatory drugs used for respiratory problems?

A) To keep the drug with them at all times to use for sudden narrowing of the airways.
B) To take the drug daily,even when symptoms of airway obstruction are not present.
C) To avoid crowds and people who are ill because of the greatly increased risk for infection.
D) To brush their teeth at least four times daily to remove the drug from the mouth and improve taste.