Step 1: Management of acute hypercalcemia aims to dilute and excrete calcium and to block bone resorption. The question asks which listed agent is NOT part of this.
Step 2: Standard measures include saline hydration with forced diuresis using a loop diuretic such as furosemide, bisphosphonates (pamidronate, zoledronate) to inhibit osteoclasts, and calcitonin for rapid but short-lived lowering.
Step 3: Special or adjunct therapies include oral phosphate, glucocorticoids (steroids, especially useful in vitamin D-mediated or granulomatous hypercalcemia) and dialysis in refractory or renal-failure cases. So steroids, bisphosphonates and phosphate are all genuine treatments.
Step 4: Strontium is not used to treat hypercalcemia. Strontium ranelate is an anti-osteoporosis drug that promotes bone formation, so it has no role here and is the exception.