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': 'The following are applicable to bacterial genome except: \nSelect and explain. \nA. It is composed of DNA, B. It does not contain histones, C. It is circular, D. Its DNA has both introns and extrons', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]