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': 'The encircled number in the given instrument formula represents 10-(80)-6-12 \nSelect and explain. \nA. Width of the blade, B. Length of the blade, C. Angulation of the blade to the long axis, D. Angulation of the cutting edge of blade to the long axis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]