This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Forensic Medicine
[{'content': "Estimation of age examination of teeth is by \nSelect and explain. \nA. Pearson's method, B. Gustafson's method, C. Gabon's method, D. Bertillon's method", 'role': 'user'}, {'content': "Answer: B \nExplanation: (B) Gustafson's method # Gustafson's method is the formula used to determine the age of a person from changes in dental structures the age estimation is useful only for a person more than 21 yrs. transparency of tooth", 'role': 'assistant'}]