28 year old primigravida gave birth to a male child which presented with midline dimple and tuft of hair in the lower back, which vitamin supplementation could have possibly prevented this if if was due to nutritional deficiency in the mother
**Core Concept**
The condition described is likely a form of spina bifida, a congenital defect of the spinal cord, characterized by an incomplete closure of the backbone and membranes around the spinal cord. This condition is often associated with neural tube defects (NTDs) and can be prevented with adequate supplementation of a specific vitamin during pregnancy.
**Why the Correct Answer is Right**
The neural tube forms in the early stages of embryonic development, and any defects that occur during this period can lead to spina bifida. Folic acid (also known as vitamin B9) is a crucial nutrient for preventing NTDs. It plays a key role in DNA synthesis and repair, and its deficiency has been linked to an increased risk of spina bifida and other neural tube defects. Studies have shown that supplementation with folic acid before and during early pregnancy can significantly reduce the risk of these defects.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while vitamin B12 is essential for the nervous system, it is not directly linked to the prevention of spina bifida or neural tube defects.
**Option B:** This option is incorrect because vitamin A is important for fetal development, but it is not specifically linked to the prevention of spina bifida or neural tube defects.
**Option C:** This option is incorrect because vitamin K is essential for blood clotting, but it is not directly related to the prevention of spina bifida or neural tube defects.
**Clinical Pearl / High-Yield Fact**
It is essential for pregnant women to take folic acid supplements, ideally starting at least one month before conception and continuing through the first trimester, to reduce the risk of neural tube defects.
**Correct Answer: D. Folic acid.**