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
Retreatment Potaper system, False is 
Select and explain. 
A. Has a non cutting tip, B. D1 with 0.30 mm diameter and 9% taper is used for coronal third, C. D2 with 0.25 diameter and 8% taper is used upto middle third, D. D3 with 0.20 diameter and 7% taper is used for apical third
A: Has a non cutting tip
Answer: A: Has a non cutting tip 
Explanation: It has a cutting tip unlike routine protaper system.