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': 'Buccal shelf lies between mandibular buccal frenum and the anterior edge of the \nSelect and explain. \nA. Buccinator muscle, B. Medial pterygoid muscle, C. Mylohyoid muscle, D. Masseter muscle', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]