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
[{'content': "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 - \nSelect and explain. \nA. Alzheimers's disease, B. Creutzfeldt Jakob disease, C. Lewy body dementia, D. Herpes simplex Encephalitis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]