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': 'Hub of wheels not formed by? \nSelect and explain. \nA. Buccinator, B. Orbicularis oris, C. Levator anguli oris, D. Mentalis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hub of wheels = Modiolus\n\nPresent on corner of mouth\nLie at level of maxillary first premolar tooth\nMentalis is not a part of it', 'role': 'assistant'}]