<prompt> A 60 year old man with progressive dementia of recent onset presents with intermittent irregular jerky movemets. EEG shows periodic sharp biphasic waves. The most likely diagnosis is:Alzheimers diseaseCreutzfeldt Jakob diseaseLewy body dementiaHerpes Simplex Encephalitis  <response>: Answer. is B Creutzfeldt Jakob disease : The combination of progressive dementia, irregular jerky movements myoclonus choreoathetoid movements in association with a characteristic EEG pattern periodic sharp biphasic waves suggests a diagnosis Creutzfeldt Jakob Disease. 