All of the following are symptoms of delirium tremens except

A. Multiple sclerosis (MS) is a disabling disease of the central nervous system (brain and spinal cord). It involves the immune system attacking the protective myelin sheath covering nerve fibers, causing communication problems between the brain and the rest of the body. This progressive damage can lead to both physical and cognitive disabilities, making it a dementia-related disorder in some advanced cases.
B. Huntington chorea (Huntington’s disease) is a genetic neurodegenerative disorder that affects movement and cognitive function, but it is not primarily defined as a disorder of both the brain and spinal cord.
C. Wernicke-Korsakoff syndrome is a brain disorder linked to chronic alcohol use and thiamine (vitamin B1) deficiency. It affects memory and coordination but is not a disease of the spinal cord.
D. Alzheimer’s disease is the most common form of dementia and is strictly a brain disorder, not one that affects the spinal cord.

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.