Which of the following is a hallmark motor manifestation of Parkinson's disease?

• A. Pin-rolling motions of fingers
• B. Shuffling gait
• C. Tremor, rigidity and bradykinesia
• D. Sudden syncope

Answer: (C)

The hallmark motor picture in Parkinson's disease is the triad of resting tremor, rigidity, and bradykinesia. Resting tremor—often seen as a pill-rolling motion of the fingers when the hands are at rest—reflects the abnormal rhythmic activity in motor circuits. Rigidity is the stiff resistance felt with movement, described as cogwheel or lead-pipe rigidity when joints are moved. Bradykinesia is the slowness of initiating and executing movements, which shows up as reduced spontaneous movement, frequent hesitation, and a characteristic shuffling gait. Together, these signs form the most characteristic motor syndrome of Parkinson's disease. Individual features like tremor or a shuffling gait can appear on their own, but the full triad best defines the condition; sudden syncope is not a typical Parkinsonian motor manifestation.