This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
Which of these is associated with Prions? 
Select and explain. 
A. DNA and RNA, B. DNA, RNA, and proteins, C. RNA and proteins, D. Only proteins
D: Only proteins
Answer: D: Only proteins 
Explanation: Prions or proteinaceous infectious paicles that lack nucleic acids. There are composed of largely 16 not entirely of PrPSE molecules. Ref: Ananthanarayana textbook of Microbiology 9th edition Pgno : 442