Which of the following cognitive changes is associated with Huntington's disease?

• A. Chorea
• B. Dementia
• C. Resting tremor
• D. Seizures

Answer: (B)

Huntington's disease affects the brain areas that control both movement and higher-level thinking, so cognitive decline is a central feature that can progress to dementia. Dementia reflects the global cognitive impairment that can accompany the disease as it advances, especially in planning, attention, and executive function. The other options describe non-cognitive features: chorea is the characteristic involuntary movements, not a cognitive change; resting tremor is more typical of Parkinson's disease; seizures are not a defining hallmark of Huntington's, though they can occur rarely. So dementia best captures the cognitive change associated with Huntington's.