The Son of a 78-Year-Old Suspected of Experiencing Alzheimer's Disease

The son of a 78-year-old suspected of experiencing Alzheimer's disease ( AD ) asks the nurse if there is a diagnostic test that can confirm the diagnosis.The nurse responds that:

A) an electroencephalogram is often very useful in diagnosing AD.
B) a positron emission tomography ( PET ) scan is a cheap but dependable tool.
C) magnetic resonance imaging ( MRI ) is often ordered for that purpose.
D) postmortem autopsy is the only definitive diagnostic tool.