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
Titres of Actinomycetem comitans are increased in: 
Select and explain. 
A. Gingivitis, B. Trauma from occlusion, C. Juvenile periodontitis, D. Cyclic neutropenia
C: Juvenile periodontitis
Answer: C: Juvenile periodontitis 
Explanation: None