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
Creutzfeldt-Jacob disease is caused by - 
Select and explain. 
A. Prion, B. JC virus, C. Genetic factors, D. Nutritional deficiency
A: Prion
Answer: A: Prion 
Explanation: CJD is a prion disease (dlow virus groupB) REF:ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.557