Correct Answer: B

Rationale: A sunken fontanelle is a common sign of dehydration in infants. The fontanelle is the soft spot on an infant's head where the skull bones have not yet fused. When an infant is dehydrated, the fontanelle can appear sunken or indented. It is important for caregivers and healthcare providers to recognize this sign promptly to ensure timely intervention and hydration for the infant.

Correct Answer: B

Rationale: The Global Immunization Vision and Strategy (GIVS) aims to improve access to high-quality immunization services globally. This objective focuses on enhancing the availability and quality of immunization services to ensure that more individuals have access to vaccines to prevent diseases.

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: B

Rationale: The primary purpose of the Field Health Services and Information System (FHSIS) is to record and report public health services. It is specifically designed to improve health service delivery and planning by systematically collecting, managing, and analyzing health-related data. Monitoring hospital services, evaluating private health services, and managing health insurance claims are not the primary functions of the FHSIS, which is focused on public health services.

Correct Answer: B

Rationale: Children aged 1-4 years are most vulnerable to protein-energy malnutrition (PEM) due to their rapid growth and development, increased nutritional requirements, and sometimes inadequate diets. This age group is particularly susceptible to malnutrition if they do not receive adequate protein and energy-rich foods to support their growth and development.