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': 'Arch blanks means: \nSelect and explain. \nA. Robotic wire bending, B. Computerized wire bending, C. Customized arch wires, D. Preformed arch wire', 'role': 'user'}, {'content': 'Answer: D \nExplanation: It is important to keep in mind that neither the ligation method nor the prescription adjustments placed in straight-wire brackets have anything to do with arch form, which is still established by\xa0the shape of the archwires.\nArch form is particularly important\xa0 during the finishing stage of treatment, when heavy rectangular archwires are employed. Preformed archwires are best considered\xa0 as “arch blanks” and sometimes are listed in the catalogs in that way. The name is appropriate, because this properly implies that a degree of individualization of their shape will be required to accommodate the needs of patients.\nContemporary orthodontics , Proffit 6th ed Page no 343', 'role': 'assistant'}]