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: Surgery
[{'content': 'All of the following are used for gradation of coma in Glasgow coma scale except: \nSelect and explain. \nA. Eye opening ,, B. Motor response, C. Verbal response, D. Bladder function', 'role': 'user'}, {'content': 'Answer: D \nExplanation: bladder dysfunction', 'role': 'assistant'}]