**Core Concept**
Perinatal transmission of HIV (Human Immunodeficiency Virus) from mother to child is a significant concern in AIDS (Acquired Immune Deficiency Syndrome) management. This transmission can occur during pregnancy, childbirth, or breastfeeding.

**Why the Correct Answer is Right**
The risk of perinatal transmission of HIV can be significantly reduced with antiretroviral therapy (ART) in the mother during pregnancy and postpartum. Additionally, administering antiretroviral prophylaxis to the newborn within 6 hours of birth, along with elective cesarean delivery before the onset of labor and before the rupture of membranes, can further reduce the risk of transmission. The use of zidovudine (AZT) during pregnancy and labor, as well as in the newborn, has been a cornerstone in preventing mother-to-child transmission of HIV.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the timing or the type of antiretroviral prophylaxis administered to the newborn, which is crucial in preventing mother-to-child transmission of HIV.

**Option B:** This option is incorrect because it is incomplete and does not specify the importance of maternal antiretroviral therapy during pregnancy and postpartum in reducing the risk of transmission.

**Option C:** This option is incorrect because it is incomplete and does not specify the importance of elective cesarean delivery before the onset of labor and before the rupture of membranes in reducing the risk of transmission.

**Clinical Pearl / High-Yield Fact**
The "4 Ps" of preventing mother-to-child transmission of HIV are:
- **Pregnancy**: Maternal antiretroviral therapy
- **Partum**: Antiretroviral prophylaxis to the newborn within 6 hours of birth
- **Postpartum**: Antiretroviral therapy in the mother
- **Prevention of breastfeeding**: Exclusive formula feeding

**Correct Answer: A.**