**Core Concept**
Severe hypercalcemia associated with hyperparathyroidism requires immediate treatment to reduce serum calcium levels and alleviate symptoms. The initial management involves the use of medications that either decrease calcium absorption from the gut, increase calcium excretion through the kidneys, or promote the deposition of calcium into bone.

**Why the Correct Answer is Right**
The initial treatment of severe hypercalcemia typically involves the administration of **calcitonin**, **intravenous fluids**, and **loop diuretics**. Calcitonin decreases bone resorption and reduces serum calcium levels. Intravenous fluids help to flush out excess calcium from the body, and loop diuretics increase calcium excretion through the urine. **Glucocorticoids**, on the other hand, can worsen hypercalcemia in the short term by increasing calcium absorption from the gut.

**Why Each Wrong Option is Incorrect**
* **Option A:** Glucocorticoids can increase calcium absorption from the gut, worsening hypercalcemia.
* **Option B:** This option is missing, please provide the correct options.
* **Option C:** This option is missing, please provide the correct options.
* **Option D:** This option is missing, please provide the correct options.

**Clinical Pearl / High-Yield Fact**
In the initial treatment of severe hypercalcemia, it's essential to remember that glucocorticoids can exacerbate the condition, and their use should be avoided until the calcium levels are normalized.

**Correct Answer:** A.