<prompt> Reversible dementia is seen in all EXCEPT:Wernickes encephalopathyAlzheimersHypothyroidismHead trauma  <response>: Ans. b AlzheimersRef: Harrisons 18th ed. 3300-07 Alzheimers disease is most common cause of irreversible dementia.Reversible vs Irreversible dementiaReversibleIrreversibleVitamin deficiency B1-Wernickes B12-SCID Nicotinic acid- PellagraAlzheimersEndocrine hypothyroidism, adrenal insufficiency, cushingsVascular dementia multi- infarctHead trauma and diffuse brain damageHaemorrh age- subdural, epidural,Normal pressure hydrocephalusLeucoencephalopathyPrimary metastatic brain tumorMetabolic disorder wilsons disease, Leigh disease, LeucodystrophyToxic dementia MCC of reversible dementiaDegenerative disorder parkinsonism, Picks disease, Prions disease, multiple sclerosis, hunting tons disease, diffuse lewy body dementia 