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 design of choice for endodontic microsurgery is the: \nSelect and explain. \nA. Sulcular flap., B. Sulcular partial-thickness flap., C. Sulcular full-thickness flap., D. Envelope flap.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The design of choice for endodontic microsurgery is the sulcular full-thickness flap\nThe mucogingival flap or Luebke-Ochsenbein flap is preffered for crowned anterior teeth for esthetic reasons. This flap which includes scalloped horizontal incision provides a guide for meticulous repositioning of the flap.\nThe first known record for endodontic flaps was by Partsch. He is credited with the Partsch incision or semilunar incision. It is a submarginal curved flap. There is limited surgical access, proor wound healing, and laximum disruption of the blood supply to the adjacent tissues.', 'role': 'assistant'}]