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': "Dean's technique refers to a form of \nSelect and explain. \nA. Radicular surgery, B. Cyst removal, C. Intraseptal alveoplasty, D. Mucoperiosteal flap", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]