Which of the following conditions is characterized by slowing of movement, stiffness, tremor, and impaired postural reflexes?

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Parkinson's disease is a neurodegenerative disorder that is characterized by the four symptoms listed: slowing of movement (bradykinesia), stiffness (rigidity), tremor, and impaired postural reflexes. Myasthenia gravis is a neuromuscular disorder that causes muscle weakness and fatigue, but not the specific symptoms listed. Bell's palsy is a type of facial paralysis caused by damage to the facial nerve, and does not affect movement or reflexes outside of the face. Multiple sclerosis is a demyelinating disorder that can cause a wide range of symptoms, but not specifically the symptoms listed.

Which of the Following Conditions Is Characterized by Slowing of Movement