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
Periodontosis manifests itself mainly in: 
Select and explain. 
A. Molars, B. Upper incisors, C. Molars and incisors, D. Premolars
C: Molars and incisors
Answer: C: Molars and incisors 
Explanation: None