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 treatment for acute periodontal abscess is \nSelect and explain. \nA. The drainage of abscess through incision only, B. Incision & drainage followed by flap surgery after the symptoms subside, C. Incision should not be given through ultrasonic tip, D. Incision should be given only external level', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]