question: Q:A 34-year-old female presents to the emergency room with headache and palpitations. She is sweating profusely and appears tremulous on exam. Vital signs are as follows: HR 120, BP 190/110, RR 18, O2 99% on room air, and Temp 37C. Urinary metanephrines and catechols are positive. Which of the following medical regimens is contraindicated as a first-line therapy in this patient?? 
  {'A': 'Phenoxybenzamine', 'B': 'Nitroprusside', 'C': 'Propranolol', 'D': 'Labetalol', 'E': 'Lisinopril'},