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
[{'content': 'Creutzfeldt-Jacob disease is caused by - \nSelect and explain. \nA. Prion, B. JC virus, C. Genetic factors, D. Nutritional deficiency', 'role': 'user'}, {'content': 'Answer: A \nExplanation: CJD is a prion disease (dlow virus groupB) REF:ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.557', 'role': 'assistant'}]