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