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
Technique to evaluate the bone regeneration after periodontal surgery Is 
Select and explain. 
A. Digital IOPA, B. CBCT, C. OPG, D. Digital subtraction radiography
B: CBCT
Answer: B: CBCT 
Explanation: None