**Core Concept**
Nevirapine is a non-nucleoside reverse transcriptase inhibitor (NNRTI) that is used in the treatment of HIV/AIDS. It works by binding to the reverse transcriptase enzyme, inhibiting its activity and preventing the replication of viral DNA.

**Why the Correct Answer is Right**
Nevirapine specifically binds to the p66 subunit of the reverse transcriptase enzyme, altering its shape and preventing the enzyme from catalyzing the conversion of viral RNA into DNA. This binding is non-competitive, meaning that it does not compete with the substrate (nucleotides) for binding to the enzyme. As a result, nevirapine inhibits the replication of HIV, reducing the viral load in the body.

**Why Each Wrong Option is Incorrect**
**Option A:** Nevirapine is a nucleoside reverse transcriptase inhibitor (NRTI). (Incorrect because NNRTIs and NRTIs have different mechanisms of action and binding sites on the reverse transcriptase enzyme)
**Option B:** Nevirapine is used to treat tuberculosis. (Incorrect because nevirapine is specifically used to treat HIV/AIDS, not tuberculosis)
**Option C:** Nevirapine is a protease inhibitor. (Incorrect because protease inhibitors work by inhibiting the protease enzyme, which is involved in the maturation of viral particles, whereas NNRTIs like nevirapine inhibit reverse transcriptase)

**Clinical Pearl / High-Yield Fact**
Nevirapine can cause hepatotoxicity, particularly in the first 6-8 weeks of treatment. It is essential to monitor liver function tests regularly when starting nevirapine therapy.

**Correct Answer:** A. Nevirapine is a non-nucleoside reverse transcriptase inhibitor (NNRTI) that is used in the treatment of HIV/AIDS.