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': 'Postural hypotension is the common side effect of which of the following ? \nSelect and explain. \nA. ACE inhibitors, B. Alpha receptor blockers, C. Arteriolar dilators, D. Selectiveβ1 blockers', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]