Most cases of early-onset Alzheimer's disease appear to be caused by
A) environmental exposure to toxins.
B) one of several rare genetic mutations.
C) HIV or some other autoimmune disease.
D) a combination of psychoactive drug abuse and poor nutrition.

Question

Quizplus · Accepted Answer

Most cases of early-onset Alzheimer's disease, which occurs before the age of 65, are caused by rare genetic mutations. In contrast, late-onset Alzheimer's disease, which occurs after the age of 65, is thought to be caused by a combination of genetic, environmental, and lifestyle factors.

Most Cases of Early-Onset Alzheimer's Disease Appear to Be Caused