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
[{'content': 'True about prion protein diseases is all, except - \nSelect and explain. \nA. Myoclonus is seen in 10% of the patients, B. Caused by infectious protein, C. Brain biopsy is diagnostic, D. Commonly manifests as dementia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most patients (~90%) with Cruetzfeldt-Jacob Disease (CJD) exhibit myoclonus that appears at various times throughout\xa0the illness.\nUnlike other involuntary movements, myoclonus persists during sleep. Startle myoclonus elicited by loud sounds or\xa0bright lights is frequent', 'role': 'assistant'}]