Correct Answer: A

Rationale: The primary reason for giving iron supplementation to pregnant women is to prevent anemia. Anemia can have detrimental effects on both the mother and the developing fetus. Iron is essential for the production of red blood cells, and during pregnancy, the demand for iron increases to support the mother's increased blood volume and the developing fetus. Anemia in pregnancy can lead to complications such as preterm birth, low birth weight, and even maternal mortality. Therefore, ensuring adequate iron intake through supplementation is crucial to prevent these adverse outcomes.

Correct Answer: C

Rationale: Neural tube defects are linked to a deficiency in folic acid intake during pregnancy. Adequate folic acid intake is crucial as it significantly reduces the risk of neural tube defects in newborns. Therefore, ensuring pregnant women have sufficient folic acid is essential in preventing this serious birth defect.

Correct Answer: C

Rationale: The correct term for the method of population assignment based on the actual physical location of the people is 'de facto.' On the other hand, 'de jure' is the method based on the usual place of residence of the people.

Correct Answer: A

Rationale: The BCG vaccine is recommended to be given at birth to protect against tuberculosis. It is often administered soon after birth to provide early protection against the disease, especially in areas where tuberculosis is prevalent.

Correct Answer: D

Rationale: Intersectoral linkages involve collaborations between the health sector and other sectors for community development. In this scenario, cooperation between a public health nurse (PHN) and a public school teacher exemplifies intersectoral linkages, as it represents a partnership between the health and education sectors.