A definitive diagnosis of Alzheimer disease (AD)can be made by detecting or using which one of the following methods?

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Confirming the development of neurofibrillary tangles is the only accurate method for diagnosing AD.Patients with AD can be observed for dementia and delirium,but these indicators are nonspecific for the disease.The inability to speak with relevance is a feature of dementia; if other causes of dementia are ruled out,then it may be dementia of the Alzheimer type.A CAT scan is the most useful means for diagnosing a stroke.

A Definitive Diagnosis of Alzheimer Disease (AD)can Be Made by Detecting