**Core Concept**
Hypercalcemia refers to elevated serum calcium levels, which can be caused by various conditions such as primary hyperparathyroidism, vitamin D intoxication, or malignancy. Treatment aims to reduce serum calcium levels and alleviate symptoms.

**Why the Correct Answer is Right**
To manage hypercalcemia, treatments typically involve reducing calcium absorption, increasing calcium excretion, or inhibiting parathyroid hormone (PTH) secretion. Options A, B, and D can be used to treat hypercalcemia. Option A, Bisphosphonates, work by inhibiting osteoclast-mediated bone resorption. Option B, Calcitonin, lowers serum calcium levels by inhibiting osteoclast activity and increasing calcium excretion. Option D, Glucocorticoids, can decrease calcium absorption and increase calcium excretion. However, the correct answer is not listed here.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not the correct answer to the question, but it is a treatment for hypercalcemia.

**Option B:** This option is not the correct answer to the question, but it is a treatment for hypercalcemia.

**Option C:** Furosemide is a loop diuretic that increases calcium excretion, making it an incorrect option. Furosemide can actually worsen hypercalcemia by increasing calcium excretion, making it a less suitable option for treatment.

**Clinical Pearl / High-Yield Fact**
It's essential to note that furosemide should be used with caution in patients with hypercalcemia, as it can increase calcium excretion and worsen symptoms.

**Correct Answer:** C. Furosemide.