question: Q:A 58-year-old man is brought to the emergency department by his family because of severe upper back pain, which he describes as ripping. The pain started suddenly 1 hour ago while he was watching television. He has hypertension for 13 years, but he is not compliant with his medications. He denies the use of nicotine, alcohol or illicit drugs. His temperature is 36.5°C (97.7°F), the heart rate is 110/min and the blood pressure is 182/81 mm Hg in the right arm and 155/71 mm Hg in the left arm. CT scan of the chest shows an intimal flap limited to the descending aorta. Intravenous opioid analgesia is started. Which of the following is the best next step in the management of this patient condition?? 
  {'A': 'Emergency surgical intervention', 'B': 'Oral metoprolol and/or enalapril', 'C': 'Sublingual nitroglycerin', 'D': 'Intravascular ultrasound', 'E': 'Intravenous esmolol'},