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': 'Technique to evaluate the bone regeneration after periodontal surgery Is \nSelect and explain. \nA. Digital IOPA, B. CBCT, C. OPG, D. Digital subtraction radiography', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]