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
Which radiographic technique gives three-dimensional view of the alveolar bony defects? 
Select and explain. 
A. Intra-oral radiograph, B. Digital intra-oral radiography, C. Orthopantamograph, D. Spiral computed tomography
D: Spiral computed tomography
Answer: D: Spiral computed tomography 
Explanation: None