This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Which of the following are non-spore forming anaerobic bacteria that assume major significance in the disease process 
Select and explain. 
A. Bacteroides fragilis, B. Fusobacterium nucleatum, C. Peptostreptococcus, D. All
D: All
Answer: D: All 
Explanation: All the above are Gram-negative non-sporing anaerobic bacilli associated commonly with a disease process. They assume major significance in the disease process Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 274