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
Periodontitis may best be described as 
Select and explain. 
A. A chronic inflammatory disease with periods of remission and exacerbation, B. A chronic inflammatory disease that usually does not manifest itself clinically before the age of 40, C. A degenerative disease of the periodontium, D. An acute inflammatory disease of long duration
A: A chronic inflammatory disease with periods of remission and exacerbation
Answer: A: A chronic inflammatory disease with periods of remission and exacerbation 
Explanation: None