Which of the following symptoms is associated with parkinsonism?

Parkinsonism is characterized by a combination of motor symptoms that result from the degeneration of the dopamine-producing neurons in the brain. The core features of parkinsonism include resting tremor, rigidity, bradykinesia (slowness of movement), and postural instability. The combination of abnormal movements such as tremor and stiffness specifically exemplifies the hallmark signs of parkinsonism.

Resting tremors usually occur when the muscles are relaxed and can affect various parts of the body, while rigidity refers to the increased tone in the muscles that leads to stiffness and resistance to passive movement. These symptoms arise as a disruption in the balance of neurotransmitters, primarily dopamine, which is crucial for coordinated movement. Therefore, the correct answer highlights the essential characteristics that define parkinsonism and its manifestation in patients.

Other symptoms such as inner restlessness or involuntary muscle contractions may be related to different movement disorders or side effects of medications and do not specifically represent the classical motor symptoms of parkinsonism. Impaired cognitive functions can occur as a secondary result but are not central features of parkinsonism itself. Thus, the answer accurately reflects the expected motor profile associated with the condition.