<prompt> All of the following casues subcoical dementia except -Alzhimers diseaseParkinsonismHIV encephalopathyProgressive supra nuclear palsy  <response>: The pa of brain affected in Alzheimers disease is cerebral coex and hippocampus. In parkinsonism, basal ganglia, coex and even the brainstemsubcoex is affected. In progressive supranuclear palsy and HIV encephalopathy there is subcoical dementia. Reference Harrison20th edition pg 2456 