## **Core Concept**
Drug-induced lupus erythematosus (DILE) is a variant of lupus erythematosus that is caused by certain medications. It shares some clinical and serological features with systemic lupus erythematosus (SLE) but is generally less severe and resolves upon withdrawal of the offending drug. The condition is associated with the presence of specific autoantibodies.

## **Why the Correct Answer is Right**
The correct answer, **D. Hydralazine**, is a medication known to induce lupus-like symptoms in some patients. Hydralazine, a vasodilator used primarily in the treatment of hypertension, is one of the classic drugs associated with drug-induced lupus erythematosus. The mechanism behind DILE involves the formation of autoantibodies, including antinuclear antibodies (ANA) and anti-histone antibodies, which are particularly associated with drugs like hydralazine.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While certain drugs can induce lupus-like reactions, without specifying which drug, it's hard to assess its accuracy. However, given that hydralazine is a known cause, if option A does not specify hydralazine or a similar drug, it would be incorrect.
- **Option B:** This option is incorrect because, without specifying a drug known to cause DILE, it's not possible to assess its accuracy directly. However, common drugs associated with DILE include hydralazine and procainamide, making any option that doesn't align with these less likely to be correct.
- **Option C:** Similar to option B, without the specific drug mentioned, it's challenging to directly label it as incorrect. However, if it does not refer to a drug known to induce lupus, such as hydralazine or procainamide, then it would be incorrect.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that drug-induced lupus erythematosus is particularly associated with **anti-histone antibodies**, which are found in a significant proportion of patients with DILE, especially those taking drugs like hydralazine and procainamide. This is a useful distinguishing feature from systemic lupus erythematosus, where a broader range of autoantibodies may be present.

## **Correct Answer: D. Hydralazine**