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': 'CSF pressure is mainly stimulated by: \nSelect and explain. \nA. Rate of CSF formation, B. Rate of CSF absorption, C. Cerebral blood flow, D. Venous pressure', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Rate of CSF absorption', 'role': 'assistant'}]