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': "Mary's law states the relationship of hea rate with which of the following parameter? \nSelect and explain. \nA. Cardiac output, B. Stroke volume, C. Aerial BP, D. Presystolic volume", 'role': 'user'}, {'content': "Answer: C \nExplanation: According to Mary's law hea rate is inversely propotional to Blood pressure. When blood pressure decreases baroreceptors present in the carotid sinus are inhibited and the net effect are: Increase in peripheral resistance Increased myocardial contractility Increased hea rate Increase in blood pressure", 'role': 'assistant'}]