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': 'All the following are obligate anaerobes except? \nSelect and explain. \nA. Actinomycetes, B. Bacteriodes, C. Clostridium, D. Pseudomonas', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pseudomonas is obligate aerobe.', 'role': 'assistant'}]