An overweight 45-year-old man comes to the emergency department because of acute chest pain that began 30 minutes ago. His pulse is 150/min with decreased peripheral pulses, and his blood pressure is 100/60 mm Hg. He was sitting at home eating dinner when he "felt his blood pressure go up," and then almost immediately experienced a sudden onset of severe, "ripping" chest pain that radiated to his back. Current medications include captopril and metoprolol, which he has not taken for several weeks. What of the following is the most appropriate imaging modality in the patient's workup?a. MRIb. Chest X-rayc. CT angiogram d. Echo

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