question: Q:A 37-year-old female presents to the emergency room complaining of headaches and palpitations. She reports that she initially started experiencing these symptoms several months prior but attributed them to stress at work. The symptoms occur episodically. Her family history is notable for medullary thyroid cancer and hyperparathyroidism. Her temperature is 98.6°F (37°C), blood pressure is 165/90 mmHg, pulse is 105/min, and respirations are 18/min. On examination she appears tremulous. Urine metanephrines are elevated. Which of the following is the most appropriate first medication in the management of this patient’s condition?? 
  {'A': 'Phenoxybenzamine', 'B': 'Propranolol', 'C': 'Phentolamine', 'D': 'Tamsulosin', 'E': 'Atenolol'},