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
Which of the following is NOT a prion disease? 
Select and explain. 
A. Bovine spongiform encephalopathy, B. Transmissible mink encephalopathy, C. Scrapie, D. Progressive multifocal leucoencephalopathy
D: Progressive multifocal leucoencephalopathy
Answer: D: Progressive multifocal leucoencephalopathy 
Explanation: Ans. is 'd' i.e., Progressive multifocal leucoencephalopathy