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
How to differentiate between bony neoplasm and cyst, Radiographically: 
Select and explain. 
A. By their sizes., B. By their shapes., C. By peripheral bone formation., D. By their location.
C: By peripheral bone formation.
Answer: C: By peripheral bone formation. 
Explanation: None