A Patient Is Being Evaluated for Alzheimer's Disease (AD)

A patient is being evaluated for Alzheimer's disease (AD) . The nurse explains to the patient's adult children that

A) the most important risk factor for AD is a family history of the disorder.
B) a diagnosis of AD is made only after other causes of dementia are ruled out.
C) new drugs have been shown to reverse AD deterioration dramatically in some patients.
D) brain atrophy detected by magnetic resonance imaging (MRI) would confirm the diagnosis of AD.