This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Identification, Subject name: Forensic Medicine
[{'content': 'The most reliable criteria in Gustafson method of age estimation is - \nSelect and explain. \nA. Attrition, B. Secondary dentin deposition, C. Transparency of root, D. Cementum apposition', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The canals in dentin become wide and are filled with mineral so that they become translucent gradually . It is not seen until thiy years of age. It is the most reliable criteria in Gustafsons method. Ref:Dr . Narayana Reddys Synopsis of Forensic Medicine & Toxicology 27th edition pg. 37.', 'role': 'assistant'}]