Vascular dementia is a brain disorder caused by decreased blood flow to the brain due to atherosclerosis.

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

Answer: (A)

Vascular dementia results from reduced blood flow to the brain due to disease of the brain’s vessels. When atherosclerosis narrows or blocks cerebral arteries, areas of the brain suffer ischemia or small strokes, leading to cognitive decline and functional impairment over time. This directly matches the statement that vascular dementia is caused by decreased blood flow to the brain caused by atherosclerosis.

Prion infections cause a different type of dementia that is not driven by blood flow or vascular disease, and they typically progress rapidly rather than through chronic vascular injury. Vascular dementia does not occur only in childhood; it mainly affects older adults and is linked to cardiovascular risk factors, with signs of cognitive and executive dysfunction and often a history of strokes or cardiovascular events. There are risk factors and signs present, not a lack thereof.