This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Circulation, Subject name: Physiology
[{'content': 'At what blood pressure the baroreceptor system is most sensitive? \nSelect and explain. \nA. 60 mm Hg, B. 100 mm Hg, C. 150 mm Hg, D. 180 mm Hg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Any homeostatic regulatory system is most sensitive and most efficient around its natural set point. The normal set point for baroreceptor system is 100 mm Hg. Around this BP, the system is maximally sensitive.', 'role': 'assistant'}]