**Core Concept**
Antiarrhythmic drugs can have varying effects on the cardiovascular and respiratory systems, particularly in patients with pre-existing conditions such as interstitial lung disease (ILD). The choice of antiarrhythmic agent is crucial in these patients to avoid exacerbating their condition.

**Why the Correct Answer is Right**
Amiodarone is a commonly used antiarrhythmic medication, but it is known to cause pulmonary toxicity, including pneumonitis and pulmonary fibrosis, especially in patients with pre-existing lung disease. This is due to its high iodine content, which can accumulate in the lungs and cause damage. Amiodarone can also cause a decrease in diffusing capacity and lung compliance, making it contraindicated in patients with ILD.

**Why Each Wrong Option is Incorrect**
**Option A:** Quinidine is not specifically contraindicated in ILD, although it can cause pulmonary toxicity in rare cases.

**Option B:** Propafenone is not typically associated with pulmonary toxicity and can be used cautiously in patients with ILD.

**Option C:** Sotalol is not specifically contraindicated in ILD, but its use may be limited by its potential to cause bronchospasm and exacerbate respiratory disease.

**Clinical Pearl / High-Yield Fact**
It's essential to consider the potential pulmonary toxicity of amiodarone when treating patients with interstitial lung disease and to carefully weigh the benefits and risks of its use.

**Correct Answer:** C. Propafenone.