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': 'A boy has 20 permanent teeth and 8 temporary teeth. His age is likely to be : \nSelect and explain. \nA. 9 yrs., B. 10 yrs., C. 11 yrs., D. 12 yrs.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. 10 years', 'role': 'assistant'}]