Which features are typically associated with Parkinson’s syndrome, a neurological disorder that is characterized by motor symptoms?

Correct answer is C). Tremor, rigidity, akinesia (slowness of movement), and postural instability are the hallmark features of Parkinson's syndrome. These motor symptoms are key indicators of this neurological disorder, which is often related to a deficiency of dopamine in the brain. A) Incorrect. Parkinson's syndrome is not primarily identified by hyperkinetic movements and muscle twitching but by specific hypokinetic motor symptoms such as tremor, rigidity, and akinesia. B) Incorrect. The key characteristics of Parkinson's syndrome are not muscle hypertonia, overactivity, or excessive reflexes. These symptoms are more associated with conditions like spasticity, not Parkinson's syndrome. D) Incorrect. While muscle weakness can be associated with Parkinson's syndrome, it is not the primary characteristic, and muscle atrophy is not a defining feature of the condition. The primary features are as described in option C.