A client diagnosed with allergic rhinitis is prescribed an antihistamine to assist with symptoms. Which of the following medications below would be considered a second-generation antihistamine?

The correct answer is A: Cetirizine (Zyrtec). Second-generation antihistamines like cetirizine have a lower risk of causing sedation compared to first-generation antihistamines like diphenhydramine (Benadryl). Second-generation antihistamines are preferred for allergic rhinitis due to their longer duration of action and reduced side effects. Lanoxin (Digoxin) and Captopril (Capoten) are not antihistamines, they are used for heart conditions and hypertension respectively. Diphenhydramine is a first-generation antihistamine known for its sedative effects. Therefore, A is the correct choice for a second-generation antihistamine in this scenario.