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: Microbiology
Which of the following are non-spore forming anaerobic bacteria that assume major significance in disease processes - 
Select and explain. 
A. Bacteroides fragilis, B. Fusobacterium nucleatum, C. Peptostreptococcus anaerobius, D. All
D: All
Answer: D: All 
Explanation: Ans. is 'd' i.e., All