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 most common sequel of gingivitis: \nSelect and explain. \nA. Pericoronitis, B. Periodontitis, C. Periodontosis, D. Periapical pathology', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]