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
Juvenile periodontitis causing bacteria belongs to which species? 
Select and explain. 
A. Streptococci, B. Fusobacterium, C. Actinomyces, D. Prevotella
D: Prevotella
Answer: D: Prevotella 
Explanation: None