Correct Answer: C

Rationale: Antiretroviral therapy is a crucial strategy in preventing mother-to-child transmission of HIV. By providing antiretroviral medications to the mother during pregnancy, labor, and breastfeeding, the risk of transmitting the virus to the child is significantly reduced. This treatment approach has been shown to be highly effective in reducing the likelihood of HIV transmission from mother to child.

Correct Answer: A

Rationale: The correct answer is A, Hepatitis B. The Hepatitis B vaccine is usually administered to newborns within the first 24 hours of birth to provide protection against Hepatitis B infection. This early vaccination helps prevent transmission of the virus from infected mothers to their babies during childbirth, reducing the risk of chronic liver disease and liver cancer later in life.

Correct Answer: C

Rationale: Malaria is caused by the Plasmodium parasite that is transmitted to humans through the bite of infected Anopheles mosquitoes. These mosquitoes act as vectors in transmitting the disease from one host to another. The other choices, Measles, Tuberculosis, and Hepatitis B, are not vector-borne diseases. Measles is a highly contagious airborne viral infection, Tuberculosis is an airborne bacterial infection, and Hepatitis B is a bloodborne virus.

Correct Answer: C

Rationale: Folic acid, a B vitamin, is essential for the development of the neural tube in the early stages of pregnancy. Adequate intake of folic acid before conception and during early pregnancy significantly reduces the risk of neural tube defects in the baby. It is recommended that women of childbearing age consume folic acid daily to support a healthy pregnancy.

Correct Answer: B

Rationale: Breastfeeding provides passive immunity to the infant by transferring antibodies from the mother to protect the infant from infections and illnesses. This is one of the key benefits of breastfeeding, as it helps boost the baby's immune system during the early stages of life.