## **Core Concept**
Fixed drug eruptions (FDEs) are a type of cutaneous adverse drug reaction characterized by skin lesions that recur at the same site each time the offending drug is administered. This condition is often associated with certain medications.

## **Why the Correct Answer is Right**
The correct answer, **C. NSAIDs, Antibiotics, and Anticonvulsants**, is right because these classes of drugs are commonly implicated in fixed drug eruptions.
- **NSAIDs (Nonsteroidal Anti-Inflammatory Drugs)**: Drugs like ibuprofen and naproxen can cause FDEs.
- **Antibiotics**: Sulfonamides, tetracyclines, and beta-lactam antibiotics are known culprits.
- **Anticonvulsants**: Medications such as phenobarbital, carbamazepine, and phenytoin have been associated with FDEs.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While some drugs not listed here can cause FDEs, this option does not specify commonly associated classes.
- **Option B:** This option might include some drugs that can cause FDEs but is not as comprehensive or accurate as option C.
- **Option D:** This option likely includes drugs less commonly associated with FDEs compared to the classes listed in option C.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the most commonly implicated drugs in fixed drug eruptions include **NSAIDs, antibiotics (especially sulfonamides)**, and **anticonvulsants**. A classic clinical feature is the recurrence of lesions at the same site upon re-exposure to the offending drug.

## **Correct Answer:** C. NSAIDs, Antibiotics, and Anticonvulsants