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
The most reliable criteria in Gustafson's method of identification is 
Select and explain. 
A. Cementum apposition, B. Transparency of root, C. Attrition, D. Root resorption
B: Transparency of root
Answer: B: Transparency of root 
Explanation: None