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': 'In a binangle hatchet push excavator, hatchet denotes the: \nSelect and explain. \nA. Class, B. Subclass, C. Order, D. Suborder', 'role': 'user'}, {'content': "Answer: A \nExplanation: G.V. Black described a way to name dental instruments which is similar to zoological classification:\n\nThe order denotes the purpose of the instrument, e.g., excavator, scaler.\nThe suborder denotes the position or manner of use of the instrument, e.g., push, pull.\nThe class describes the form of the blade, e.g., hatchet, chisel.\nThe angle denotes the number of angles in the shank. If the instrument contains one angle in its shank, it is called monangle. If it contains two angles, it is called binangle. If it contains three angles, it is called triple-angle. Four angles are called quaternary-angle.\nNaming of the instruments usually moves from 4 to 1.\n\nFor example, a binangle hatchet push excavator. In most cases, the suborder describing the position or manner of use is variable and non-specific, and for practical purposes, it is usually omitted. Identifying the working end and the purpose of the instrument is sufficient, e.g., binangle hatchet excavator.\nRef: Sturdevant's art and science of operative dentistry. 4th edition page 309\nOperative dentistry modern theory and practice Marzouk page 59", 'role': 'assistant'}]