question: Q:A 19-year-old woman presents to the ED after multiple episodes of vomiting in the last 6 hours. The vomitus is non-bloody and non-bilious. The vomiting started shortly after she began having a throbbing, unilateral headache and associated photophobia. She has had several similar headaches in the past. Her vital signs are unremarkable. Which of the following is an appropriate therapy for this patient's vomiting?? 
  {'A': 'Propranolol', 'B': 'Amitriptyline', 'C': 'Ergonovine', 'D': 'Chlorpromazine', 'E': 'Calcium channel blockers'},