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 adult CSF pressure is: \nSelect and explain. \nA. 1-2 mm Hg, B. 6-12 mm Hg, C. 15-30 mm Hg, D. 730 mm Hg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. 6 - 12 mmHg', 'role': 'assistant'}]