A nurse is caring for a client who has asthma and allergies. The client asks the nurse about environmental influences they should avoid. The nurse should inform the client to avoid which of the following?

A. Hepatitis B is a viral infection and not an environmental trigger for asthma or allergies. B. Cockroaches are known environmental allergens and common asthma triggers. Their saliva, feces, and body parts can worsen asthma symptoms and allergic reactions. C. Radon is a radioactive gas linked to lung cancer risk, not asthma or allergy exacerbation. D. Mold can trigger asthma and allergies, but cockroaches are a more specifically recognized allergen in asthma management, especially in urban environments.