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
Which of the following conditions cannot be detected by bone scintigraphy? 
Select and explain. 
A. Avascular necrosis, B. Fractures, C. Osteomyelitis, D. None
D: None
Answer: D: None 
Explanation: None