You are answering a USMLE-style medical question. Question: A 39-year-old woman, with a history of thyroidectomy and primary hyperparathyroidism presents for surgical evaluation for a right adrenal mass. Preoperatively, which of the following medications should she receive to prevent a hypertensive emergency intraoperatively? Options: A) Atenolol B) Labetolol C) Nifedipine D) Phenoxybenzamine Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.