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
The extent of bony defects can be best estimated by 
Select and explain. 
A. Long cone parallel radiographic technique, B. Sequential probing, C. Use of Florida probe, D. Transgingival probing
D: Transgingival probing
Answer: D: Transgingival probing 
Explanation: None