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 position or manner of use of an instrument is described by: \nSelect and explain. \nA. Class, B. Suborder, C. Subclass, D. Order', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dr\xa0 Black\xa0 prescribed\xa0 four\xa0 classes,\xa0 similar\xa0 to\xa0 a\xa0 biological\xa0classification:\xa0\nOrder - Purpose of instrument\xa0\nSuborder - Position or manner of use\xa0\nClass - Form of working end\xa0\nSubclass - Shape of the shank.', 'role': 'assistant'}]