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': 'Propranolol is not used in: \nSelect and explain. \nA. A–V block, B. Hypertension, C. Hypertrophic obstructive cardiomyopathy, D. Migraine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]