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
[{'content': 'Which of the following are non-spore forming anaerobic bacteria that assume major significance in the disease process \nSelect and explain. \nA. Bacteroides fragilis, B. Fusobacterium nucleatum, C. Peptostreptococcus, D. All', 'role': 'user'}, {'content': "Answer: D \nExplanation: 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", 'role': 'assistant'}]