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': 'The Normal Poal venous pressure is: \nSelect and explain. \nA. 4-6 mm Hg, B. 8-12 mm Hg, C. 26-30 mm Hg, D. 12-16 mm saline', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 8-12 mm Hg', 'role': 'assistant'}]