The recommended dietary allowance of Calcium for pregnant females is:
**Core Concept**
The recommended dietary allowance (RDA) of calcium for pregnant females is crucial for fetal bone development and maternal health. Adequate calcium intake supports the growth and mineralization of fetal bones, teeth, and other tissues. Calcium also plays a vital role in maintaining maternal bone density and preventing complications like preeclampsia.
**Why the Correct Answer is Right**
During pregnancy, the demand for calcium increases due to the growth and development of the fetus. The RDA for calcium in pregnant females is set at 1,000 mg/day, which is higher than the non-pregnant adult requirement. This increased requirement is essential for the formation of the fetal skeleton, teeth, and other tissues. The placenta also plays a crucial role in calcium metabolism, regulating the transfer of calcium from the mother to the fetus.
**Why Each Wrong Option is Incorrect**
**Option A:** This option does not provide a specific value for the RDA of calcium in pregnant females, making it an incomplete choice.
**Option B:** This option suggests a lower RDA than the established recommendation, which may not meet the increased calcium demands of pregnancy.
**Option C:** This option is higher than the established RDA, but the exact value is not specified, making it an unclear choice.
**Clinical Pearl / High-Yield Fact**
Pregnant females with inadequate calcium intake are at increased risk of preeclampsia, gestational hypertension, and preterm labor. Adequate calcium supplementation during pregnancy can significantly reduce these risks and support fetal growth and development.
**Correct Answer: C. 1,200 mg/day**