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': 'Which radiographic technique gives three-dimensional view of the alveolar bony defects? \nSelect and explain. \nA. Intra-oral radiograph, B. Digital intra-oral radiography, C. Orthopantamograph, D. Spiral computed tomography', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]