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': 'Denture Cleanliness index was given by? \nSelect and explain. \nA. Budtz-Jörgensen, B. Stoyanova-.Pasheva, C. Arrendorf, T. M. and Walker, D. Turrell', 'role': 'user'}, {'content': 'Answer: A \nExplanation: patients can be divided into three groups using the following index of denture cleanliness :\nBudtz-Jörgensen index of denture cleanliness\nExcellent: none or only few spots of plaque.\nFair: more extended plaque, less than half of the denture base covered by plaque.\nPoor: more than half of the denture base covered by plaque', 'role': 'assistant'}]