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': 'Certain viruses have been isolated in crystalline\nform and have been found to be \nSelect and explain. \nA. Nucleotides, B. Phospholipids, C. Scteroproteins, D. Nucleoproteins', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]