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': 'A 33 years old patient with history of asthma is being treated for symptoms of hypertension. Which of the following beta blocker would be an appropriate therapy for this patient: \nSelect and explain. \nA. Isoprenaline, B. Labetalol, C. Metoprolol, D. Propranolol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]