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': 'Gas gangrene is caused by all except \nSelect and explain. \nA. Cl. Histolyticum, B. Cl. novyi, C. Cl. septicum, D. Cl. Sporogenes', 'role': 'user'}, {'content': "Answer: D \nExplanation: Gas gangrene is rapidly spreading, edematous myonecrosis occurring characteristically in association with a severe wound of extensive muscle mass contaminated by pathogenic clostridia. Most frequently encountered is clostridium perfringes. Also caused by clostridium novyi, Clostridium septicum and clostridium histolyticum. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 261", 'role': 'assistant'}]