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 the following periodontal surgeries the one that is\nperformed first: \nSelect and explain. \nA. Infrabony pocket therapy, B. Gingivectomy, C. Apically displaced flap, D. Gingivoplasty', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]