The following best describes dementia except

A. Gradual progressive onset. Dementia typically has a gradual onset and progresses over time. This is true for most types of dementia, such as Alzheimer's disease, where symptoms slowly worsen over months and years. B. Can be classified as either primary or secondary. Dementia can be classified as primary (such as Alzheimer's disease or frontotemporal dementia, where the brain itself is primarily affected) or secondary (where dementia is caused by another condition, such as a stroke or a brain injury). C. It does not interfere with navigation of daily life. This statement is incorrect. One of the defining features of dementia is that it does interfere with daily life. As cognitive functions decline, individuals often have difficulty with tasks such as managing finances, cooking, driving, and maintaining personal hygiene. D. It is irreversible. While some types of dementia (like Alzheimer's disease) are irreversible and progressive, there are certain conditions, like some forms of vascular dementia, where the progression can be slowed or stabilized if the underlying cause is addressed. However, many forms of dementia are indeed irreversible.