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': 'Diagnosis of bone defect is done accurately by: \nSelect and explain. \nA. Clinical examination, B. Radiographs, C. Surgical exposure, D. Probing', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]