This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Dementia Due to Metabolic Causes, Subject name: Psychiatry
Reversible dementia causes are all except- 
Select and explain. 
A. Myxedema, B. Subdural hematoma, C. Vitamin B12 deficiency, D. Lewy body dementia
D: Lewy body dementia
Answer: D: Lewy body dementia 
Explanation: Ans, is 'd' i.e., Lewy body dementia Causes of dementiaReversible causes Surgically treatableo Normal pressure hydrocephaluso Brain tumors (frontal lobe tumor)o Meningiomao Subdural hematoma (Head injury)o HydrocephalusMedically treatable o Hypothyroidismo Depressiono HIV infectiono Alcohol abuseo Vitamin B12 , Folate. Niacin deficiencyo Any metabolic or endocrine disturbanceo Neurosyphiliso Hashimoto's encephalopathyo Wilson's diseaseo Celiac disease or Whipple's diseaseo Chronic meningoencephalitiso Drugs and toxin (toxic dementia)Irreversible causeso Alzheimer s diseaseo Vascular (Multi-infarct) dementiao Parkinson's diseaseo Huntington's choreao Creutzfeld Jakob diseaseo Lewy body dementiao Pick's diseaseo Overall Alzheimer's disease is the most common cause. Vascular dementia is the 2nd most common cause.