<prompt> Reversible cause of dementia isHypothyroidismAlzheimers diseaseHuntington choreaVitamin A deficiency  <response>: Dementia Types:- The dementia can be divided in to reversible and irreversible dementias. It is extremely impoant to do detailed work up of a patient of dementia as around 15 of cases are reversible. The reversible causes of dementia are:- A. Neurosurgical conditions subdural hematoma, normal pressure hydrocephalus, intracranial tumors, intracranial abscess. B. Infectious causes meningitis, encephalitis, neurosyphilis, lyme disease. C. Metabolic causes vitamin B12 or folate deficiency, niacin deficiency, hypo and hypehyroidism, hypo and hyperparathyroidism D. Others drugs and toxins, alcohol abuse, autoimmune. Ref:- Psychiatry by Sandeep Govil; pg num:- 35 