<prompt> Reversible dementia is a feature of:Alzheimers diseasePicks diseaseMultiinfarct dementiaHypothyroidism  <response>: Ans: D Hypothyroidism Ref: Harrison s Textbook of Internal MedicineExplanationDementiaIt is a syndrome characterized byMemory disturbances typically acquisition recent memory are impairedAgnosia inability to recognise like ones nameAphasia inability to talk properlyApraxia inability to do which were done with ease beforeExecutive dysfunction unable to perform the previously performed.dearned activitiesDementia is basically due to degeneration of neurons of brain.Depending upon the site, it may be cortical Alzheimers disease or subcortical Parkinsons disease or mixed VascularMulti-infarct dementia.While the degeneration is progressive, sometimes if the cause is removed or treated, the dementia resolves.Hence, depending upon the reversibility, there are1. Irreversible dementias Alzheimers disease. Multi-infarct dementia2. Reversible FEDUPFailure of other organs CCF, CO PD Respirator failure. Renal failure, etc.Endocrine hypothyroidism, hypoparathyroidism, hypoadrenalism, diabetesDrugs chemotherapy UnderOver minerals vitamins defieciency states esp. Vitamin B 1,2,6,12 Toxicity due to chronic exposure ingestion of to aluminium, arsenic, leadPsychiatric conditions depression, schizophrenia 