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': 'Gas gangrene bacilli is: September 2004 \nSelect and explain. \nA. Facultative anaerobe, B. Obligate anaerobe, C. Facultative aerobe, D. Obligate aerobe', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Obligate anaerobe', 'role': 'assistant'}]