<prompt> The most common cause of dementia isFronto-Temporal dementiaSenile dementiaMulti-infarct dementiaAlzheimers disease  <response>: Causes of Dementia: Alzheimers most common in 65 years oldVascular dementiaMulti-infarct dementiaLewy body dementiaFronto-Temporal dementia 50-70 yearsHuntingtonsTraumaticDementia pugilisticaCreutzfeldt-Jakob disease Reversible causes of DementiaStructural brain lesions:- Normal Pressure Hydrocephalus, SubDural Hematoma, Brain TumorsAlcohol dementia Wernickes encephalopathyVitamin B12 deficiencyEndocrine:- HypoHyper-thyroidism, Hypo-ParathyroidismMetabolic disorders:- Dyselectrolytemia Na, Ca, K, hepatic or renal failureAutoimmune:- Hashimotos paraneoplastic encephalopathy anti- Yo, Hu, RiInfections:- Whipples, Lyme disease, Syphilis, HIV dementia. 