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': 'Citron bodies are formed by \nSelect and explain. \nA. Clostridium welchii, B. Clostridium oedematiens, C. Clostridium septicum, D. Clostridium histolyticum', 'role': 'user'}, {'content': "Answer: C \nExplanation: Clostridium septicum: form citron bodies, boat or leaf-shaped polymorphic bacilli. Motile by peritrichous flagella. Saccharolytic and produce abundant gas. Produce alpha, beta, delta and gamma toxin. Gas gangrene or malignant edema are characteristic Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 260", 'role': 'assistant'}]