## **Core Concept**
Pulmonary fibrosis is a condition characterized by scarring of lung tissue, leading to respiratory impairment. Certain medications can induce this condition as a side effect. The question tests knowledge of drugs associated with pulmonary fibrosis.

## **Why the Correct Answer is Right**
Bleomycin is a chemotherapeutic agent known to cause pulmonary toxicity, including pulmonary fibrosis, as a dose-dependent side effect. The mechanism involves the generation of reactive oxygen species and direct damage to lung tissue. This association is well-documented, making bleomycin a classic example in pharmacology and oncology.

## **Why Each Wrong Option is Incorrect**
* **Option A:** While certain antineoplastic agents can cause lung injury, without specifying, it's hard to assess its accuracy directly. However, the most well-known association is with bleomycin.
* **Option B:** This option is not specified, but generally, not all chemotherapy agents cause pulmonary fibrosis; the risk varies by drug.
* **Option C:** Similarly, without specifics, it's challenging to evaluate, but again, the association is not as strong or well-known as with bleomycin.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **bleomycin-induced pulmonary fibrosis** is dose-dependent and can be fatal. Monitoring lung function tests is crucial in patients on bleomycin. A classic clinical correlation is that pulmonary toxicity limits the cumulative dose of bleomycin that can be administered.

## **Correct Answer:** D. Bleomycin.