How is Alzheimer's disease diagnosed in humans?
A. Through ruling out all other causes of dementia because the characteristic beta-amyloid plaques can only be assessed in a postmortem examination of brain tissue.
B. Through a PET scan to see how the brain and its tissues are working because Alzheimer's diseased brains have a characteristic type of functioning.
C. Through an MRI or CT scan to observe the structure of the brain and identify whether the characteristic plaques and tangles are present.
D. Through a series of neurological tests that indicate symptoms of Alzheimer's disease exclusively (not present in other forms of dementia).
Answer: A
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Fill in the blank(s) with the appropriate word(s).