Vascular dementia is primarily caused by what?

• A. Caused by prion infection.
• B. It is a result of decreased blood flow to the brain caused by atherosclerosis.
• C. Only occurs in childhood.
• D. There is no risk or signs.

Answer: (B)

Vascular dementia results from reduced blood flow to the brain due to vascular disease, such as atherosclerosis and related cerebrovascular problems. When arteries narrow or a stroke occurs, parts of the brain don’t get enough oxygen and nutrients, leading to cell damage and cognitive changes. This vascular mechanism explains the pattern of decline often seen after strokes and varies with where the brain is affected.

Other options describe different diseases or false ideas: a prion infection causes a separate neurodegenerative condition, dementia can occur at older ages rather than being limited to childhood, and there are indeed risks and signs associated with vascular brain disease.