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: B

Rationale: Administering antiretroviral therapy to HIV-positive mothers is a crucial practice to reduce the risk of mother-to-child transmission of HIV. Antiretroviral therapy helps lower the viral load in the mother's body, decreasing the chance of passing the virus to the child during pregnancy, childbirth, or breastfeeding. Exclusive breastfeeding, using unsterilized medical equipment, and avoiding prenatal care do not directly contribute to reducing HIV transmission from mother to child.

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: D

Rationale: The Maternal and Child Health (MCH) program aims to reduce infant mortality, improve maternal health, and provide family planning services. It focuses on both preventive and curative care to promote the health and well-being of mothers and children. While curative care is a component of the program, it is not the sole focus as prevention and early intervention are equally important in achieving positive health outcomes.

Correct Answer: D

Rationale: Primary Health Care (PHC) is a comprehensive approach that includes preventive, promotive, curative, and rehabilitative care. It focuses on prevention, community participation, equitable distribution of resources, and the use of appropriate technology to address health needs. Exclusively focusing on curative care goes against the holistic nature of PHC.