Which statement best describes Parkinson's disease?

Which statement best describes Parkinson's disease?

• A. A disorder of the central nervous system that affects movement, often including tremors.
• B. A degenerative condition of the spine.
• C. An infectious disease of the spinal cord.
• D. A form of hearing impairment.

Answer: (A)

Parkinson's disease is a progressive neurodegenerative condition of the brain's movement-control system. It involves loss of dopamine-producing neurons in the substantia nigra, a key brain area for coordinating movement, which disrupts the circuits that allow smooth, purposeful motion. This leads to motor symptoms such as tremors (often present at rest), stiffness, slowed movement, and balance difficulties. The statement that it is a disorder of the central nervous system that affects movement and commonly includes tremors best fits because it locates the problem in the brain, not the spine, and links it to movement and a recognizable tremor feature. The other options describe issues that are outside the brain’s movement system: a spine degenerative condition, an infectious spinal cord disease, or a hearing impairment, none of which capture Parkinson's core brain-based, movement-related nature.

Parkinson's disease is a progressive neurodegenerative condition of the brain's movement-control system. It involves loss of dopamine-producing neurons in the substantia nigra, a key brain area for coordinating movement, which disrupts the circuits that allow smooth, purposeful motion. This leads to motor symptoms such as tremors (often present at rest), stiffness, slowed movement, and balance difficulties. The statement that it is a disorder of the central nervous system that affects movement and commonly includes tremors best fits because it locates the problem in the brain, not the spine, and links it to movement and a recognizable tremor feature. The other options describe issues that are outside the brain’s movement system: a spine degenerative condition, an infectious spinal cord disease, or a hearing impairment, none of which capture Parkinson's core brain-based, movement-related nature.