Review Question - QID 108963

A 59-year-old male presents to his primary care physician complaining of a tremor. He developed a tremor in his left hand approximately three months ago. It appears to be worse at rest and diminishes if he points to something or uses the hand to hold an object. His past medical history is notable for emphysema and myasthenia gravis. He has a 40 pack-year smoking history. Physical examination reveals slowed movements. The patient takes several seconds to rise from his chair for a gait analysis which reveals a shuffling gait. The physician decides to start the patient on a medication that prevents the degradation of a neurotransmitter. This medication is also indicated for use in which of the following conditions?