## **Core Concept**
The question tests knowledge of antiretroviral therapy (ART) used to prevent mother-to-child transmission (PMTCT) of HIV, particularly during breastfeeding. The goal is to identify a drug effective in this context.

## **Why the Correct Answer is Right**
is the correct answer because **Nevirapine** is a non-nucleoside reverse transcriptase inhibitor (NNRTI) used in the prevention of mother-to-child transmission of HIV. A single dose of Nevirapine given to the mother at the onset of labor and a single dose given to the newborn within 72 hours of birth has been shown to significantly reduce the risk of HIV transmission. This regimen is effective and has been widely used, especially in resource-limited settings.

## **Why Each Wrong Option is Incorrect**
- **Option A:** is incorrect because while it might represent another antiretroviral drug, without specifics, it's hard to judge its relevance to PMTCT, especially during breastfeeding.
- **Option B:** is incorrect because, similarly, without specifics, it's unclear if it's used for PMTCT.
- **Option D:** is incorrect because it does not specifically relate to the well-known regimen for preventing mother-to-child transmission of HIV during breastfeeding.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **Nevirapine** is used as a single dose to prevent mother-to-child transmission of HIV and has a role in settings where more complex regimens are not feasible. Breastfeeding mothers with HIV should exclusively breastfeed for the first 6 months of life and continue breastfeeding while introducing complementary foods, through 24 months of age or older.

## **Correct Answer:** .