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 Tarnow's technique, the method described for denuded root surface is \nSelect and explain. \nA. Semilunar coronally repositioned flap, B. Split thickness coronally repositioned flap, C. Free soft tissue autograft, D. Subepithelial connective flap", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]