A nurse is caring for a client with allergic rhinitis.The client is newly prescribed guaifenesin.What is the medication class for this medication?

Choice A rationaleDecongestants relieve nasal congestion by reducing swelling of the nasal passages.Choice B rationaleMucolytics thin and loosen mucus in the airways, making it easier to cough up.Choice C rationaleAntitussives suppress coughing.Choice D rationaleExpectorants, like guaifenesin, help thin and loosen mucus, making it easier to clear from the airways.