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': 'Prokaryotes have: \nSelect and explain. \nA. Nuclear membrane, B. Nucleolus, C. DNA, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: DNA', 'role': 'assistant'}]