Correct Answer: B

Rationale: The WHO's Health For All strategy focuses on achieving a level of health that allows individuals to lead socially and economically productive lives, emphasizing overall well-being beyond just physical health. This approach aims for a holistic improvement in health outcomes rather than just providing free healthcare or focusing solely on increasing healthcare infrastructure or workforce.

Correct Answer: C

Rationale: Folic acid is the most critical nutrient for preventing neural tube defects during pregnancy. Neural tube defects are serious birth defects of the brain and spinal cord. Adequate intake of folic acid before and during early pregnancy can significantly reduce the risk of these defects. Iron, calcium, and vitamin D are important nutrients during pregnancy for other reasons, such as supporting the increased demands on the body for blood production, bone health, and calcium absorption, respectively.

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: C

Rationale: Vaccination is the most effective method for preventing the spread of infectious diseases as it helps in developing immunity against specific pathogens, reducing the likelihood of infection and transmission within a population. Antibiotics are used to treat infections, not prevent their spread. Quarantine limits the contact of infected individuals but does not provide long-term prevention. Nutritional supplementation can support overall health but is not a primary method for preventing infectious diseases.

Correct Answer: B

Rationale: The goal of the Safe Motherhood Initiative is to enhance maternal health by reducing maternal mortality and morbidity. This initiative focuses on improving the health outcomes of pregnant women and new mothers, ensuring safer pregnancies and childbirth experiences.