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.

Correct Answer: B

Rationale: Physical inactivity is a major risk factor for cardiovascular diseases as it contributes to a sedentary lifestyle, leading to obesity, high blood pressure, and other cardiovascular issues. Regular physical activity helps maintain a healthy heart and reduces the risk of developing cardiovascular diseases.

Correct Answer: A

Rationale: Administering oral rehydration solution is an appropriate method for treating dehydration in infants. Oral rehydration solution helps replace lost fluids and electrolytes effectively, aiding in the rehydration process. It is specifically formulated to address dehydration and is recommended by healthcare professionals for managing this condition in infants.

Correct Answer: B

Rationale: Vaccination is a preventive measure used in public health to protect against infectious diseases by stimulating the immune system to develop immunity without causing the disease. It helps prevent the spread of infectious diseases within communities and is a cost-effective way to reduce the burden of illnesses.