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
In the radiographic assessment of periodontal disease, information cannot be obtained is 
Select and explain. 
A. crown - root ratio, B. faulty restoration, C. Approximate bone height, D. Morphology of bone deformities
D: Morphology of bone deformities
Answer: D: Morphology of bone deformities 
Explanation: None