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: Pathology
Best way to differentiate a periapical cyst and a perapical granuloma is 
Select and explain. 
A. Radiographically, B. Histologically, C. Clinically, D. None of the above
B: Histologically
Answer: B: Histologically 
Explanation: None