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
[{'content': 'Which of the following is false about Protaper system \nSelect and explain. \nA. It has non cutting Tips, B. Conventionally has set of 6 files Sx S1 S2 F1 F2 and F3, C. F1 has 0.25 mm diameter and 8% taper, D. There is separate system for retreatment cases.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]