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
Which of the following species is found in abundance in adult plaque? 
Select and explain. 
A. Fusobacterium, B. Leptotrichia, C. Bacteroids, D. All of the above
A: Fusobacterium
Answer: A: Fusobacterium 
Explanation: None