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: Dental
In universal pro-taper retreatment file end cutting tip is seen in? 
Select and explain. 
A. D-1, B. D-2, C. D-3, D. None of the above
A: D-1
Answer: A: D-1 
Explanation: None