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: A

Rationale: Hepatitis A is a waterborne disease caused by a virus that can be transmitted through contaminated water or food. Ingestion of even microscopic amounts of fecal matter from an infected person can lead to infection. It is important to practice good hygiene and ensure water sources are clean to prevent the spread of Hepatitis A.

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: 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.

Correct Answer: B

Rationale: The primary benefit of exclusive breastfeeding for the first 6 months of life is to ensure that the infant receives complete nutrition. Breast milk provides all the necessary nutrients for a baby's growth and development, along with protection against infections, making it the best source of nutrition for infants in the first months of life.