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
[{'content': 'Which zone is not found when repair is done with MTA: \nSelect and explain. \nA. Zone if calcification., B. Zone of inflammation., C. Zone of necrosis., D. Zone of irritation.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]