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 position of internal bevel incision for gingivectomy surgeries is at \nSelect and explain. \nA. 3mm coronal to mucogingival junction, B. 3mm apical to mucogingival, C. At the mucogingival junction, D. 1.5 mm apical to mucogingival junction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: With a #15 Bard-Parker blade, the initial scalloped internal bevel incision is made at least 3 mm coronal to the mucogingival junction, including the creation of new interdental papillae.\nThe same blade is used to thin the gingival tissues in a buccolingual direction to the mucogingival junction. At this point the blade establishes contact with the alveolar bone, and a full-thickness or a split-thickness flap is elevated.', 'role': 'assistant'}]