The Nurse Is Administering an Antihistamine to a Patient with Nasal

The nurse is administering an antihistamine to a patient with nasal allergies.The nurse is aware that antihistamines have a distinct limitation, including:

A) They block both H-1 and H-2 receptors.
B) They are useful only during acute attacks.
C) They have potent cholinergic side effects
D) They are useful only for prophylaxis.