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': 'Radiographically the level of normal interproximal alveolar crest corresponds to \nSelect and explain. \nA. Epithelial attachment, B. CEJ of adjacent teeth, C. DEJ, D. Gingival margin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]