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: Surgery
[{'content': 'Dentigerous cyst arises from- \nSelect and explain. \nA. An unerupted tooth, B. Apex of an infected tooth, C. Nasopalatine cysts, D. Solitary bone cyst', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]