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
Dense mass of connective tissue seen in endodontically treated teeth called as: 
Select and explain. 
A. Periapical cyst, B. Periapical granuloma, C. Residual cyst., D. Periapical scar.
D: Periapical scar.
Answer: D: Periapical scar. 
Explanation: None