A degenerative disease characterized by dementia and "dance-like" movements is known as?

The correct answer is Huntington's Chorea, which is a degenerative disease that is specifically associated with both dementia and chorea, characterized by "dance-like" movements. The condition stems from a genetic mutation that leads to progressive degeneration of nerve cells in the brain, resulting in motor dysfunction along with cognitive decline and psychiatric symptoms.

Huntington's Chorea typically manifests in mid-adulthood and is distinguished by its movement disorders, where individuals may exhibit jerky, uncontrolled movements that resemble dancing, alongside significant changes in behavior and cognitive function. The combination of these symptoms is a hallmark of the disorder and sets it apart from other neurodegenerative diseases.

In comparison, other conditions listed have different characteristics: Parkinson's disease predominantly involves tremors, rigidity, and bradykinesia, but dementia is not the primary symptom early in the disease. Alzheimer's disease primarily leads to memory loss and cognitive decline without the movement disorders associated with Huntington's. Multiple sclerosis can cause a range of neurological symptoms, including cognitive changes, but it is not typically characterized by chorea or "dance-like" movements. Thus, the defining features of dementia and chorea make Huntington's Chorea the correct answer.