A 62-year-old woman with Stage 4 CKD (eGFR 22 mL/min/1.73m²), diabetes mellitus type 2, and hypertension is found to have serum phosphate of 5.2 mg/dL and serum calcium of 8.1 mg/dL. She is not yet on dialysis. What is the drug of choice to control her hyperphosphatemia?

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