Which statement is true about Alzheimer's disease?

• A. Typically onset is after age 60.
• B. Fully curable with antibiotics.
• C. Primarily caused by a vitamin deficiency.
• D. Primarily a disorder of the autonomic nervous system.

Answer: (A)

Alzheimer's disease is a progressive brain disorder that most often begins in late adulthood. The statement that onset typically occurs after age 60 is correct because the majority of cases develop in the 60s and beyond, with late-onset Alzheimer’s being the common form. It’s not cured by antibiotics, since antibiotics target infections, not the neurodegenerative brain changes seen in Alzheimer’s. It isn’t caused by a vitamin deficiency, and while deficiencies can cause cognitive symptoms, Alzheimer’s involves characteristic brain changes like amyloid plaques and tau tangles, not a simple shortage of a vitamin. It also isn’t primarily a disorder of the autonomic nervous system; the main impact is on the cerebral cortex and hippocampus, leading to progressive memory loss and cognitive decline.