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': 'Alpha 1 blocker used for BHP is: \nSelect and explain. \nA. Tamsolusin, B. Prazosin, C. Oxazosin, D. Dolazoline', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Tamsolusin', 'role': 'assistant'}]