**Core Concept**
HIV integrase inhibitors are a class of antiretroviral drugs that target the integrase enzyme, which is essential for the integration of HIV DNA into the host cell genome. This mechanism prevents the replication of the virus.

**Why the Correct Answer is Right**
The correct answer is a class of drugs that specifically inhibit the integrase enzyme, which is responsible for the integration of viral DNA into the host genome. This action prevents the viral DNA from being integrated into the host cell genome, thereby blocking viral replication. The integrase enzyme is a crucial step in the HIV life cycle, and its inhibition is a key mechanism of action for these drugs.

**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because protease inhibitors target the protease enzyme, which is involved in the processing of viral proteins, not the integrase enzyme.
**Option B:** This is incorrect because reverse transcriptase inhibitors target the reverse transcriptase enzyme, which is involved in the transcription of viral RNA into DNA, not the integrase enzyme.
**Option C:** This is incorrect because entry inhibitors target the entry of the virus into the host cell, not the integration of viral DNA into the host genome.

**Clinical Pearl / High-Yield Fact**
All HIV integrase inhibitors have a similar mechanism of action, but they differ in their pharmacokinetic properties, such as half-life and dosing frequency. It is essential to understand the unique characteristics of each drug to optimize treatment regimens.

**Correct Answer:** D. Raltegravir (and other HIV integrase inhibitors)