This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Which of the following antihistamine can be used topically in allergic rhinitis? \nSelect and explain. \nA. Terfenadine, B. Azelastine, C. Cetrizine, D. Fexofenadine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Azelastine, Astemizole, Ketotifen, Olopatadine are the antihistaminics that can be used topically in allergic rhinitis and conjuctivitis.', 'role': 'assistant'}]