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': 'Not true about gas gangrene: \nSelect and explain. \nA. Most common cause is Cl perfringens, B. Extensive necrosis of muscles, C. Cl perfringens produce heat-labile spores, D. Metronidazole is the drug of choice', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is. 'd' i. e. Metronidazole is the drug of choice", 'role': 'assistant'}]