## **Core Concept**
Myocarditis refers to inflammation of the heart muscle, often caused by infections, autoimmune disorders, or as a side effect of certain medications. Drug-induced myocarditis is a rare but potentially life-threatening condition. Various classes of drugs, including antibiotics, anesthetics, and anticancer agents, have been implicated.

## **Why the Correct Answer is Right**
The correct answer involves identifying a drug known to cause myocarditis as a side effect. Among the given options, **Interferon** (often used in the treatment of chronic viral infections and certain cancers) is recognized for its potential to cause myocarditis. This is due to its immune-modulating effects, which can sometimes lead to an autoimmune response against the heart muscle.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Without the specific drug listed, it's hard to directly refute, but generally, not all drugs cause myocarditis.
- **Option B:** Similarly, without specifics, we can't directly address, but many drugs do not have myocarditis as a known side effect.
- **Option C:** This option is potentially correct or incorrect based on the drug listed; however, if it's not known for causing myocarditis, it would be incorrect.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **Interferons**, particularly **Interferon-alpha**, have been associated with cardiovascular side effects, including myocarditis and cardiomyopathy. This is a critical consideration in patients undergoing treatment with these agents, especially those with pre-existing heart conditions.

## **Correct Answer:** D. Interferon.