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: Dental
[{'content': 'The various habits of the lips can be divided into following, except: \nSelect and explain. \nA. Lip sucking, B. Lip thrust, C. Lip insufficiency, D. None of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The various habits of the lips can be divided into following:\n\nLip sucking\xa0\nLip thrust\nLip insuﬃciency', 'role': 'assistant'}]