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 one of the following is a relatively selective α2 adrenergic blocker with short duration of action ? \nSelect and explain. \nA. Prazosin, B. Yohimbine, C. Terazosin, D. Doxazosin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]