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: Pathology
[{'content': "The most reliable criteria in Gustafson's method of identification is \nSelect and explain. \nA. Cementum apposition, B. Transparency of root, C. Attrition, D. Root resorption", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]