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': 'Non-motile Clostridia is \nSelect and explain. \nA. Clostridium perfringens, B. Clostridium novyi, C. Clostridium botulism, D. Clostridium difficle', 'role': 'user'}, {'content': "Answer: A \nExplanation: Clostridia are motile with peritrichous flagella. Exceptions are Clostridium perfringes and Clostridium tetani type IV which are non-motile. Motility is slow and has been described as 'stately'. C.perfringens and C.butyricum are capsulated, while others are not. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 257", 'role': 'assistant'}]