**Core Concept**
Exanthematous skin eruptions, also known as drug rashes, are a common side effect of various medications. These eruptions occur due to an allergic or hypersensitivity reaction, often involving the immune system's response to a drug. The exact pathophysiology involves the activation of T-cells and the release of cytokines, leading to inflammation and skin lesions.

**Why the Correct Answer is Right**
The correct answer is a drug that is less likely to cause exanthematous skin eruptions. Some medications, such as anticonvulsants, allopurinol, and certain antibiotics (e.g., sulfonamides), are well-known to cause drug rashes. These medications often induce a cell-mediated immune response, leading to the activation of T-cells and the subsequent release of cytokines, resulting in skin lesions. In contrast, certain medications like antacids (e.g., ranitidine) and analgesics (e.g., ibuprofen) are less likely to cause exanthematous skin eruptions.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because anticonvulsants, such as carbamazepine, are known to cause Stevens-Johnson syndrome, a severe form of exanthematous skin eruption. **Option B:** This option is incorrect because allopurinol is a well-known cause of drug rashes, particularly in patients with a history of previous reactions to other medications. **Option C:** This option is incorrect because certain antibiotics, such as sulfonamides, are notorious for causing exanthematous skin eruptions.

**Clinical Pearl / High-Yield Fact**
When suspecting a drug rash, it's essential to discontinue the offending medication and consider alternative treatments. A thorough medical history, including a detailed list of medications, is crucial in identifying the causative agent.

**Correct Answer: D.**