Which features define Stage 3 mid-stage Parkinson's disease?

• A. Mild symptoms with unilateral signs
• B. Mild symptoms with bilateral signs
• C. Moderate symptoms with loss of balance and bradykinesia
• D. Severe symptoms with inability to live independently

Answer: (C)

Stage 3 mid-stage Parkinson's disease is marked by symptoms on both sides of the body with some postural instability, yet the person remains physically independent. The description of moderate symptoms with loss of balance and bradykinesia fits this level best because it reflects bilateral involvement and the emergence of balance problems while still allowing independent daily functioning.

The other options describe phases that are earlier or later in the course: unilateral signs align with the earliest stage, mild bilateral signs without balance issues correspond to a stage before balance is affected, and severe symptoms with an inability to live independently indicates a late, highly disabled stage.