**Core Concept**
Perinatal prevention of mother-to-child transmission (MTCT) of infections involves strategies to reduce the risk of transmission during pregnancy, childbirth, and the postnatal period. This includes antiretroviral therapy (ART), cesarean delivery, and antiretroviral prophylaxis for the newborn.

**Why the Correct Answer is Right**
Antiretroviral therapy (ART) is a cornerstone in the prevention of MTCT of HIV, reducing the viral load in the mother and thereby decreasing the risk of transmission to the child. ART during pregnancy, labor, and postpartum, along with elective cesarean delivery before the onset of labor and rupture of membranes, significantly reduces the risk of MTCT. Additionally, antiretroviral prophylaxis for the newborn, such as zidovudine (AZT), is administered to prevent infection.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not specified, so it cannot be evaluated.
* **Option B:** This option is not specified, so it cannot be evaluated.
* **Option C:** This option is not specified, so it cannot be evaluated.

**Clinical Pearl / High-Yield Fact**
A key strategy in preventing MTCT of HIV is to initiate ART as soon as possible in the pregnancy, ideally before 28 weeks of gestation, and continue it throughout the pregnancy, labor, and postpartum period.

**Correct Answer: A. ART, cesarean delivery, and antiretroviral prophylaxis for the newborn.**