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 seen when repair is done with most biocompatible material? \nSelect and explain. \nA. Zone of necrosis, B. Zone of irritation, C. Zone of calcification, D. Zone of proliferation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]