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: Dental
Which zone is not found when repair is done with MTA: 
Select and explain. 
A. Zone if calcification., B. Zone of inflammation., C. Zone of necrosis., D. Zone of irritation.
C: Zone of necrosis.
Answer: C: Zone of necrosis. 
Explanation: None