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': 'Anaerobic bacteria grow \nSelect and explain. \nA. in the presence of oxygen, B. in the presence of nitrogen, C. in the absence of oxygen, D. differential media', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]