question: Q:Two weeks after hospitalization for acute psychosis, a 27-year-old woman with a history of paranoid schizophrenia comes to the physician because of difficulty walking and shaking movements of her hands. Current medications include fluphenazine, which was started during her recent hospitalization. Examination shows a shuffling gait, rigidity in the upper extremities, and a low-amplitude tremor of her hands that improves with activity. Mental status examination shows no abnormalities. Treatment with a drug with which of the following mechanisms of action is most likely to provide relief for this patient's current symptoms?? 
  {'A': 'β-adrenergic antagonist', 'B': 'GABA agonist', 'C': 'Dopamine antagonist', 'D': 'Histamine antagonist', 'E': 'Muscarinic antagonist'},