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': "Gustafson's method used for age estimation of the tooth includes all except - \nSelect and explain. \nA. Primary dentition, B. Root resorption, C. Root transparency, D. Attrition", 'role': 'user'}, {'content': "Answer: A \nExplanation: Gustafson's method includes :\n\n(i) Attrition, \n(ii) Paradentosis,\n(iii) Secondary dentin formation,\n(iv) Cementum apposition,\n(v) Root resorption and\n(iv) Transparency of the root.", 'role': 'assistant'}]