Parkinson's disease causes which of the following?

Parkinson's disease is a progressive neurological disorder that primarily affects movement. The correct response highlights key symptoms commonly associated with this condition. Muscle rigidity occurs due to increased muscle tone, which leads to stiffness and difficulty in moving. Drooling can be a result of difficulties in swallowing and controlling saliva due to impaired motor function. Hand tremors, often described as "resting tremors," are another hallmark sign, typically presenting when the hand is at rest and becoming less pronounced with intentional movement.

The symptoms of muscle rigidity, drooling, and hand tremors are characteristic of Parkinson's disease and help differentiate it from other disorders. Understanding these specific symptoms is crucial for early diagnosis and management of the disease by healthcare professionals.