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': 'Which of the following factor regulates CSF pressure? \nSelect and explain. \nA. Rate of CSF formation, B. Rate of CSF absorption, C. Cerebral blood flow, D. Blood pressure', 'role': 'user'}, {'content': "Answer: B \nExplanation: Rate of CSF formation normally remains constant and is independent of CSF pressure. CSF absorption by arachnoid villi is propoionate to CSF pressure. Ref: Barrett K.E., Barman S.M., Boitano S., Brooks H.L. (2012). Chapter 33. Circulation through Special Regions. In K.E. Barrett, S.M. Barman, S. Boitano, H.L. Brooks (Eds), Ganong's Review of Medical Physiology, 24e.", 'role': 'assistant'}]