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: Forensic Medicine
[{'content': '20 permanent teeth and 8 temporary teeth are seen at the age of : \nSelect and explain. \nA. 10 years, B. 11 years, C. 9 years, D. 12 years', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. 10 years', 'role': 'assistant'}]