Which statement best describes Parkinson's disease?

• A. Chronic progressive neurodegenerative disease of dopamine-producing neurons
• B. Acute infectious disease
• C. Autoimmune demyelinating disease
• D. Peripheral neuropathy

Answer: (A)

Parkinson's disease is a chronic, progressive neurodegenerative disorder in which dopamine-producing neurons in the substantia nigra die off, leading to reduced dopamine in the striatum. This loss disrupts the basal ganglia circuits that coordinate movement, producing the characteristic motor symptoms such as tremor at rest, slowness (bradykinesia), stiffness (rigidity), and balance problems. The description that best fits is a chronic, progressive neurodegenerative disease of dopamine-producing neurons because it directly reflects both the long-term course and the core pathology driving the movement difficulties. It’s not an acute infectious illness, nor an autoimmune demyelinating disease like multiple sclerosis, nor a peripheral neuropathy, since those involve different mechanisms and parts of the nervous system.