At the Present Time,the Definitive Diagnosis of Alzheimer's Disease Can

Multiple Choice

At the present time,the definitive diagnosis of Alzheimer's disease can be made:

A) by the neurofibrillary tangles and senile plaques in neural tissue upon microscopic examination during a brain biopsy or autopsy.
B) by clinical observation of progressive mental status changes.
C) whenever there is a loss of ability to read,write,calculate,and communicate intelligently in persons older than 65.
D) by the use of a positive emission tomography (PET) revealing decreased blood flow and metabolism of glucose and oxygen in the brain.