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': 'Mean aerial pressure is : \nSelect and explain. \nA. Systolic + (Diastolic BP)/ 2, B. Systolic + 1/3rd Pulse pressure, C. Diastolic + (Systolic BP)/ 2, D. Diastolic + 1/3rd Pulse pressure', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Systolic +1/3rd pulse pressure', 'role': 'assistant'}]