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: Psychiatry
[{'content': "Dementia is/are pesent in all except: \nSelect and explain. \nA. Alzeimer's disease, B. Pick's disease, C. Lewy body, D. Ganser syndrome", 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Ganser syndrome', 'role': 'assistant'}]