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: Pediatrics
[{'content': 'The normal concentration of protein in CSF at 4 weeks may be as high as – \nSelect and explain. \nA. 500mg%, B. 125mg%, C. 50mg%, D. 25mg%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: It is 15-40 mg%.', 'role': 'assistant'}]