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: Medicine
[{'content': 'All are true regarding GB syndrome, Except - \nSelect and explain. \nA. Predominant motor involvement, B. Absence of myelocytosis in CSF, C. Residual disability if treatment is delayed, D. Sparing of bladder function', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]