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
Radiographically the level of normal interproximal alveolar crest corresponds to 
Select and explain. 
A. Epithelial attachment, B. CEJ of adjacent teeth, C. DEJ, D. Gingival margin
B: CEJ of adjacent teeth
Answer: B: CEJ of adjacent teeth 
Explanation: None