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: Medicine
[{'content': 'Prions include: \nSelect and explain. \nA. DNA and RNA, B. Only RNA, C. Proteins, D. Only DNA', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer is C (Proteins): Prions are infectious proteins devoid of any nucleic acid (RNA or DNA)', 'role': 'assistant'}]