This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
[{'content': 'If a person has an arterial blood pressure of 125/75 mm Hg: \nSelect and explain. \nA. The pulse pressure is 40 mm Hg, B. The mean arterial pressure is 92 mm Hg, C. Diastolic pressure is 80 mm Hg, D. Systolic pressure is 120 mm Hg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. The mean arterial pressure is 92 mm HgBy convention, the first of the two numbers is the systolic pressure and the second is the diastolic pressure.Pulse pressure =125-75 mm Hg= 50 mm HgMean arterial pressure = Diastolic pressure + one third of pulse pressure= 75 mm Hg + 50 mm Hg/3= 92 mm Hg', 'role': 'assistant'}]