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': 'If interdental bone is apical to interradicular bone, it is \nSelect and explain. \nA. positive architecture, B. negative architecture, C. plateau, D. none', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]