This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Clostridium, Subject name: Microbiology
[{'content': 'Non motile Clostridia is: \nSelect and explain. \nA. Clostridium tetanomorphum, B. Clostridium histolyticum, C. Clostridium septicum, D. Clostridium perfringens', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans: D (Clostridium perfringens) Ref: Ananthnarayan R. Paniker CKJ. Textbook of Microbiology. 8th Edition. Hyderabad: Universities Press: 2009. Pg. 249Explanation:Most Clostridia are motile with peritrichate flagella.The motility is slow' and has been described as 'stately'.Only Cl perfringens and Cl tetani Type VI are nonmotile.", 'role': 'assistant'}]