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 the following is infectious protein - 
Select and explain. 
A. Avidin, B. Prion, C. Tau protein, D. None
B: Prion
Answer: B: Prion 
Explanation: Ans. is 'b' i.e., Prion o Prions are infectious particle which contains protein onlyo They do not have nucleic acid.