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': "One of the following is a reversible cause of dementia - \nSelect and explain. \nA. Toxic dementia, B. Alzheimer's ds., C. Multi-infarct dementia, D. Pick ds.", 'role': 'user'}, {'content': "Answer: A \nExplanation: Reversible causes of dementia\n\nSurgically treatable:- Normal pressure hydrocephalus, brain tumors (frontal lobe tumor), meningioma, subdural hematoma due to head injury, hydrocephalus.\nMedically treatable:- Depression, hypothyroidism, alcohol abuse, vitamin B 12/folate/Niacin deficiency, any metabolic or endocrine disturbance, neurosyphilis, Hashimoto's encephalopathy, Wilson's disease, celiac disease, Whipple's disease, chronic meningoencephalitis, drugs and toxin (toxic dementia).\n\nIrreversible causes of dementia:- Alzheimer's disease, vascular (multi-infarct) dementia, Parkinsonism, Huntington's chorea, Lewy body dementia, Pick's disease.", 'role': 'assistant'}]