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': 'Black pigmented anaerobes include all of the following except \nSelect and explain. \nA. Tannerella, B. Porphyromonas, C. Buccae, D. Prevotella', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]