The best way to diagnose Alzheimer's in a living person is with:

a) interviews with friends and family.
b) physical exams and tests.
c) memory and psychiatric tests.
d) all of the above.

A diagnosis of Alzheimer's disease can only be confirmed by tissue analysis after death. However, doctors can diagnose the disease with up to 90% accuracy through a combination of interviews, physical exams, and mental tests.