## **Core Concept**
Tetany is a condition characterized by muscle cramps, spasms, or tremors, often caused by low calcium levels (hypocalcemia) in the blood. It can also be caused by low magnesium levels or alkalosis. The management of tetany focuses on correcting the underlying cause, particularly addressing hypocalcemia.

## **Why the Correct Answer is Right**
The correct approach to managing tetany, especially in an emergency setting like a casualty, involves administering calcium to alleviate the symptoms. This is because the most common and immediately life-threatening cause of tetany is hypocalcemia. Administering calcium can rapidly correct the serum calcium levels, thus providing symptomatic relief.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Without specifics on what "A" entails, it's hard to directly refute, but generally, if it doesn't involve administering calcium or addressing the cause of tetany directly, it would be incorrect.
- **Option B:** Similarly, without details, if "B" does not directly address hypocalcemia or the symptoms of tetany appropriately, it's incorrect.
- **Option C:** This option is not provided, so we proceed with the understanding that the correct answer is the one that involves appropriate management.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that in the acute management of tetany, especially if caused by hypocalcemia, intravenous calcium gluconate is often administered. It's crucial to also investigate and manage the underlying cause of the hypocalcemia. Additionally, while treating, it's essential to monitor for potential complications like cardiac arrhythmias.

## **Correct Answer:** D.