This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
A 60 yr old man with C/O progressive dementia for the past 6 months with intermittent jerky movement involving whole body from 2 days. EEG showed sharp bipolar spikes. 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: EEG findings... 1) Periodic sharp wave complex = Creutz feldt kacob disease 2) periodic lateralizing discharge =Herpes simplex encephalitis Ref Harrison20th edition pg 2456