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': 'The most reliable criteria in Guastafson 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: Transparency of root is the most reliable criterion in Gustafson's method.", 'role': 'assistant'}]