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 flap design ideal for root end surgical procedures in upper anterior teeth with ceramic crowns is the \nSelect and explain. \nA. Semilunar flap, B. Trapezoidal flap, C. Triangular flap, D. Submarginal scalloped flap', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]