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
[{'content': "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 \nSelect and explain. \nA. Alzheimer's, B. Creutzfeld Jakob disease, C. Lewy body dementia, D. Herpes simplex encephalitis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: EEG findings... 1) Periodic sharp wave complex = Creutz feldt kacob disease 2) periodic lateralizing discharge =Herpes simplex encephalitis Ref Harrison20th edition pg 2456', 'role': 'assistant'}]