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': 'MTA is used for \nSelect and explain. \nA. Apexification only of any dentition, B. Apexification of primary tooth only, C. Apexification of permanent tooth only, D. Apexogenesis of any dentition', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]