This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epilepsy and EEG, Subject name: Medicine
All of the following shows positive myoclonus except? 
Select and explain. 
A. Hepatic encephalopathy, B. Variant CJD, C. Janz syndrome, D. Salaam seizures
A: Hepatic encephalopathy
Answer: A: Hepatic encephalopathy 
Explanation: Negative myoclonus: Metabolic cause which contributes to development of myoclonus. E.g. Metabolic encephalopathies Variant CJD- stale / reflex myoclonus variant (loud noise causes a myoclonus) Janz syndrome- Juvenile myoclonic epilepsy Hypnogogic jerks: Falling to sleep and sudden jerky movement e.g. while going off to sleep