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': 'Taper present in 20 number GT file is \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]