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: Medicine
[{'content': 'Blood pressure is defined as the product of. \nSelect and explain. \nA. Systolic pressure x pulse, B. Diastolic pressure x pulse rate, C. Pulse pressure x pulse rate, D. Cardiac output x peripheral resistance', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Peripheral resistance x cardiac output: Blood pressure is defined as the product of cardiac output and peripheral resistance. Blood pressure = Cardiac output x peripheral resistance or Blood flow (Q) x resistance (R)', 'role': 'assistant'}]