The nurse is providing preconception counseling. Which supplement should the nurse recommend to help prevent the occurrence of anencephaly?
Explanation & Rationale
Choice A reason: Iron supports red blood cell production and prevents anemia in pregnancy but has no specific role in neural tube development, thus not preventing anencephaly directly. Choice B reason: Vitamin D aids calcium absorption and bone health but lacks evidence linking it to neural tube defect prevention, making it irrelevant for anencephaly risk reduction. Choice C reason: Folic acid is essential for neural tube closure in early fetal development; adequate intake (400-800 mcg daily) significantly reduces anencephaly risk, a severe neural tube defect. Choice D reason: Calcium supports maternal and fetal bone health but does not influence neural tube formation, offering no protective effect against anencephaly during preconception or pregnancy.