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: Medicine
A 60-yr-old man with a complaint of progressive dementia for the past 6 months with intermittent jerky movement involving the whole body from 2 days. EEG showed periodic sharp biphasic waves. Diagnosis is - 
Select and explain. 
A. Alzheimer's, B. Creutzfeld Jakob disease, C. Lewy body dementia, D. Herpes simplex encephalitis
B: Creutzfeld Jakob disease
Answer: B: Creutzfeld Jakob disease 
Explanation: None