This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Organic Mental Disorders, Subject name: Psychiatry
[{'content': 'True about dementia is all except: \nSelect and explain. \nA. Often irreversible, B. Hallucinations are not common, C. Clouding of consciousness is common, D. Nootropics have limited role', 'role': 'user'}, {'content': 'Answer: C \nExplanation: There is no disturbance of consciousness in dementia. It is often irreversible. The hallucination can be present but are not common. Nootropics (or cognitive enhancers) have very limited role in the management of dementia.', 'role': 'assistant'}]