Parkinson's disease is associated with which of the following symptoms?

Parkinson's disease is characterized by a specific type of tremor known as a "pill-rolling tremor." This tremor is typically seen at rest and involves a distinctive movement where the thumb and fingers mimic the motion of rolling a small object, like a pill. This symptom is one of the cardinal features of Parkinson's and is part of the broader category of resting tremors that also include rigidity, bradykinesia, and postural instability.

In contrast, other symptoms provided in the options are not directly associated with Parkinson's disease. Chorea refers to involuntary, unpredictable movements that are often seen in conditions like Huntington's disease, while essential tremor usually manifests as action tremors that occur during voluntary movement rather than at rest, differing from the pill-rolling tremor of Parkinson's. Lastly, twitching movements are nonspecific and can be related to various conditions but do not specifically characterize Parkinson's disease, making them less relevant in this context.

The association of the pill-rolling tremor with Parkinson's disease is critical for diagnosing and understanding this neurodegenerative disorder.