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 transmitted through blood and body fluids. It is not an environmental trigger for asthma or allergies, so avoidance is not relevant to managing respiratory or allergic symptoms. B. Mold produces spores that are common allergens and can trigger asthma attacks or worsen allergic symptoms. Clients with asthma or allergies should minimize exposure to damp environments, visible mold, and areas prone to fungal growth. C. Radon is a radioactive gas linked to lung cancer with long-term exposure, but it is not a typical trigger for asthma or allergic reactions. While radon mitigation is important for general lung health, it does not specifically address asthma or allergy management. D. Cockroach droppings, saliva, and shed body parts contain allergens that can exacerbate asthma and allergic reactions. Avoiding exposure through proper pest control and cleanliness is recommended for clients with asthma or allergies.