A 42-year-old woman with MEN 2A syndrome presents with hypertension (BP 165/105 mmHg), palpitations, and diaphoresis. Plasma free metanephrines are elevated at 4.2 nmol/L (normal <0.9). Imaging confirms a 3 cm left adrenal mass consistent with pheochromocytoma. What is the drug of choice for preoperative preparation before surgical resection?

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