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 tooth is tender on vertical percussion. It may be due to \nSelect and explain. \nA. Osteomyelitis, B. Periapical inflammation, C. Necrotic pulp, D. Angular bone loss', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]