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
Mean aerial pressure is calculated as: 
Select and explain. 
A. (SBP + 2DBP)/ 3, B. (DBP + 2SBP)/ 3, C. (SBP + 3DBP)/ 2, D. (DBP + 3SBP)/ 2
A: (SBP + 2DBP)/ 3
Answer: A: (SBP + 2DBP)/ 3 
Explanation: A i.e. (SBP + 2DBP) /3