What is the most common cause of dementia?

A. Multiple sclerosis is a chronic neurological condition that affects the central nervous system, but it is not the most common cause of dementia. While some people with multiple sclerosis may develop cognitive changes, it is not a primary cause of dementia. B. Brain injury can result in cognitive impairments and changes in memory, but it is not the most common cause of dementia. Traumatic brain injury may lead to a type of dementia known as post-traumatic dementia, but it is relatively rare compared to Alzheimer's disease. C. Huntington chorea (also called Huntington's disease) is a genetic disorder that leads to progressive movement, cognitive, and psychiatric problems. It can cause dementia, but it is a much less common cause compared to Alzheimer's disease. D. Alzheimer's disease is the most common cause of dementia, accounting for the majority of cases. Alzheimer's is a progressive neurodegenerative disease that primarily affects memory, thinking, and behavior, ultimately impairing a person’s ability to perform daily activities.