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': 'Prions consist of: \nSelect and explain. \nA. DNA and RNA, B. DNA, RNA and proteins, C. RNA and proteins, D. Only proteins', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Only protein', 'role': 'assistant'}]