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
Degeneration of periodontal tissue without inflammation is called 
Select and explain. 
A. Periodontosis, B. Periodontitis, C. Pericorinitis, D. Desquamative gingivitis
A: Periodontosis
Answer: A: Periodontosis 
Explanation: None