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': 'An 18-year-old-female patient with swelling and pain in the mandibular third molar area will most likely to have: \nSelect and explain. \nA. juvenile periodontitis, B. pericoronitis, C. pregnancy epulis, D. plasma cell gingivitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]