Which of the following is an example of an expectorant?

Guaifenesin is characterized as an expectorant because it works by loosening mucus in the airways, making it easier for patients to cough up phlegm. This function is particularly beneficial in conditions where mucus buildup can obstruct airflow, such as in bronchitis or other respiratory illnesses. By promoting the clearance of mucus, expectorants help improve respiratory function and can enhance overall breathing comfort.

Other agents mentioned perform different roles; for example, dextromethorphan is primarily a cough suppressant, which works to decrease the urge to cough rather than expelling mucus. Fluticasone is a corticosteroid that reduces inflammation in the airways but does not facilitate mucus clearance. Loratadine is an antihistamine used to alleviate allergy symptoms, including runny nose and sneezing, rather than addressing mucus production or aiding in expectoration.