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
Which of the following Universal pro-taper re-treatment file has end cutting tip? 
Select and explain. 
A. D1, B. D2, C. D3, D. All of the above
A: D1
Answer: A: D1 
Explanation: None