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 calculated as: \nSelect and explain. \nA. (SBP + 2DBP)/ 3, B. (DBP + 2SBP)/ 3, C. (SBP + 3DBP)/ 2, D. (DBP + 3SBP)/ 2', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. (SBP + 2DBP) /3', 'role': 'assistant'}]