## **Core Concept**
Hypercalcemia is a condition characterized by elevated calcium levels in the blood, often caused by hyperparathyroidism, malignancy, vitamin D intoxication, and familial hypocalciuric hypercalcemia. Management involves treating the underlying cause and correcting hypercalcemia.

## **Why the Correct Answer is Right**
The correct approach to managing hypercalcemia includes **treating the primary cause** (such as hyperparathyroidism or malignancy), which aligns with option a) Rx of the primary cause. **IV fluid hydration with loop diuretics like furosemide** is a standard treatment to enhance calcium excretion, supporting option c) IV fluid with Frusemide is given. **Bisphosphonates**, such as **pamidronate** (not Amidronate, which seems to be a distractor), are effective in lowering calcium levels in hypercalcemia of malignancy, making option d) incorrect as it states Amidronate is not effective.

## **Why Each Wrong Option is Incorrect**
- **Option B:** Malignancy can indeed produce hypercalcemia through various mechanisms, including parathyroid hormone-related protein (PTHrP) production, making this statement incorrect.
- **Option D:** Amidronate seems to be a confusion; however, drugs like **pamidronate** are effective in treating hypercalcemia, particularly of malignancy. The confusion here might arise from the name; **pamidronate** is a known and effective agent.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that in the management of hypercalcemia, **aggressive hydration** with normal saline, followed by **loop diuretics** like furosemide, and **bisphosphonates** are mainstays of treatment. Also, identifying and treating the **primary cause** is crucial.

## **Correct Answer:** C.