Which neurological disease affects movement and often includes tremors?

• A. Headache
• B. Epilepsy
• C. ALS
• D. Parkinson's disease

Answer: (D)

Movement disorders with tremor point to Parkinson's disease. In Parkinson's, loss of dopamine-producing neurons in the substantia nigra disrupts the basal ganglia circuits that coordinate movement. This leads to resting tremor (often described as a pill-rolling tremor), along with bradykinesia (slowed movement), muscle rigidity, and a tendency to a stooped posture. The tremor is most noticeable when the muscles are at rest and often diminishes with purposeful movement, which helps distinguish it from other conditions. Headache is a pain condition, epilepsy is characterized by seizures, and ALS mainly causes progressive weakness and muscle wasting rather than tremor as its defining feature, making Parkinson's the best fit for a disease that affects movement and often includes tremors.