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
Taper present in 20 number GT file is 
Select and explain. 
A. 0.06, 0.08, 0.10, 0.12, B. 0.006, 0.008, 0.01, 0.012, C. 0.6, 0.8, 1.0, 1.2, D. 0.03, 0.04, 0.05, 0.06
A: 0.06, 0.08, 0.10, 0.12
Answer: A: 0.06, 0.08, 0.10, 0.12 
Explanation: None