<prompt> Sub coical dementia is seen in all exceptMultiple sclerosisAlzheimers diseaseParkinsons diseaseHIV related dementia  <response>: People with these types of dementia usually have severe memory loss and cant remember words or understand language.Alzheimers and Creutzfeldt-Jakob disease are two forms of coical dementia.Subcoical dementias happen because of problems in the pas of the brain beneath the coex. Ref ganongs review of medical physiology 25e p751 