## Core Concept
Digitalis toxicity occurs due to excessive levels of digitalis glycosides in the body, leading to various cardiac and extracardiac symptoms. The management of digitalis toxicity involves several strategies, including stopping the digitalis preparation, administering activated charcoal if the ingestion was recent, and using specific treatments to counteract the toxic effects.

## Why the Correct Answer is Right
The treatment of digitalis toxicity often involves the use of **digoxin-specific antibody fragments (Fab)**. These are highly effective in binding to digoxin and reducing its toxicity. Other treatments may include **potassium supplements** to counteract hypokalemia, which can exacerbate digitalis toxicity, and **magnesium** to treat or prevent magnesium deficiency, which can also contribute to digitalis toxicity. **Phenytoin** or **lignocaine (lidocaine)** can be used to manage certain cardiac arrhythmias associated with digitalis toxicity.

## Why Each Wrong Option is Incorrect
* **Option A:** Not specified, assuming it's one of the treatments.
* **Option B:** Not specified, assuming it's one of the treatments.
* **Option D:** Not specified, assuming it's one of the treatments.

## Clinical Pearl / High-Yield Fact
A key point to remember is that **calcium** is generally not used in the treatment of digitalis toxicity and can even worsen the situation. Calcium can increase the intracellular calcium levels, which can exacerbate the toxic effects of digitalis on the heart.

## Correct Answer: C. Calcium.