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
Denture Cleanliness index was given by? 
Select and explain. 
A. Budtz-Jörgensen, B. Stoyanova-.Pasheva, C. Arrendorf, T. M. and Walker, D. Turrell
A: Budtz-Jörgensen
Answer: A: Budtz-Jörgensen 
Explanation: patients can be divided into three groups using the following index of denture cleanliness :
Budtz-Jörgensen index of denture cleanliness
Excellent: none or only few spots of plaque.
Fair: more extended plaque, less than half of the denture base covered by plaque.
Poor: more than half of the denture base covered by plaque