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 technique to produce limited removal of epithelial tissue in the sulcus while a chamfer finish line is being created in tooth structure is called \nSelect and explain. \nA. Soft tissue modification, B. Gingettage, C. Gingival displacement, D. Electrosurgery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]