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: Radiology
Bone Density is best studied by – 
Select and explain. 
A. CT scan, B. DEXA scan, C. MRI scan, D. Bone scan
B: DEXA scan
Answer: B: DEXA scan 
Explanation: DEXA scan is the gold standard test for screening of bone density (to rule out asteoporosis).