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: Anatomy
[{'content': 'Function of CSF can be: \nSelect and explain. \nA. Protective., B. Nutritive., C. Pathway for excretion from the CNS., D. All of the above.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]