Definitive diagnosis of Alzheimer's disease is currently possible only after death due to examination for signs of what brain marker?

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Multiple Choice

Definitive diagnosis of Alzheimer's disease is currently possible only after death due to examination for signs of what brain marker?

Explanation:
Definitive confirmation comes from direct examination of brain tissue, where the hallmark lesions of Alzheimer's—amyloid plaques and tau tangles—can be seen under a microscope. Only after death can a neuropathologist perform a postmortem examination to verify these plaques, which is why that option is the best answer. In living patients, tests like imaging or biomarkers can strongly suggest Alzheimer’s, but they aren’t considered absolutely conclusive.

Definitive confirmation comes from direct examination of brain tissue, where the hallmark lesions of Alzheimer's—amyloid plaques and tau tangles—can be seen under a microscope. Only after death can a neuropathologist perform a postmortem examination to verify these plaques, which is why that option is the best answer. In living patients, tests like imaging or biomarkers can strongly suggest Alzheimer’s, but they aren’t considered absolutely conclusive.

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