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: Physiology
[{'content': 'Activation of the baroreceptor reflex \nSelect and explain. \nA. Is primarily involved in short-term regulation of systemic blood pressure., B. Leads to an increase in heart rate because of inhibition of the vagal cardiac motor neurons., C. Inhibits neurons in the CVLM., D. Excites neurons in the RVLM.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The baroreceptors are stretch receptors in the walls of the heart and blood vessels. The carotid sinus and aortic arch receptors monitor the arterial circulation. The baroreceptors are stimulated by distention of the structures in which they are located, and so they discharge at an increased rate when the pressure in these structures rises.', 'role': 'assistant'}]