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
True about prion protein diseases is all, except - 
Select and explain. 
A. Myoclonus is seen in 10% of the patients, B. Caused by infectious protein, C. Brain biopsy is diagnostic, D. Commonly manifests as dementia
A: Myoclonus is seen in 10% of the patients
Answer: A: Myoclonus is seen in 10% of the patients 
Explanation: Most patients (~90%) with Cruetzfeldt-Jacob Disease (CJD) exhibit myoclonus that appears at various times throughout the illness.
Unlike other involuntary movements, myoclonus persists during sleep. Startle myoclonus elicited by loud sounds or bright lights is frequent