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Dementia is considered by a progressive weakening of cognitive ability. Persons with dementia have multiple cognitive deficits include both memory impairment, and or more of the following symptoms-aphasia, apraxia, agnosia, or executive dysfunction. The most common type of dementia is Alzheimer Dementia, which accounts for 50% of all patients with dementia. Also, there are other kinds of dementia such as Vascular Dementia, Parkinson Dementia, Frontotemporal Dementia, Lewy body Dementia.