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': 'In Periapical surgery, which of the following flap designs\nlimit access to the operative site and often heals with scar formation \nSelect and explain. \nA. Envelope, B. Rectangular, C. Semilunar, D. Triangular', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]