## **Core Concept**
The daily iodine requirement increases during pregnancy due to the increased thyroid hormone production needed for the fetus and mother. Iodine is crucial for the synthesis of thyroid hormones, which play a vital role in fetal brain development and growth. The World Health Organization (WHO) and other health institutions have emphasized the importance of adequate iodine intake during pregnancy.

## **Why the Correct Answer is Right**
The correct answer of 150 μg is recommended because pregnant women have a higher demand for iodine to support the increased production of thyroid hormones for both the mother and the fetus. The thyroid gland of the fetus starts producing thyroid hormones at around 11 weeks of gestation, and it depends entirely on the maternal supply of iodine until then. Adequate iodine intake during pregnancy helps prevent maternal and fetal hypothyroidism, which can lead to cretinism, intellectual disability, and other developmental issues in the offspring.

## **Why Each Wrong Option is Incorrect**
- **Option A: 50 μg** - This is the recommended daily intake for non-pregnant adults, not for pregnant women. Pregnant women require more iodine than non-pregnant women due to the increased demands of the fetus.
- **Option B: 100 μg** - While closer, this is still below the recommended daily intake for pregnant women. Some guidelines may suggest this for non-pregnant adults or for mild iodine deficiency, but it's not sufficient for pregnancy.
- **Option D: 200 μg** - Although 150-200 μg/day is often cited as a safe and adequate intake for pregnant women, 200 μg is higher than the generally recommended increase, and excessive iodine intake can also have adverse effects.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that iodine requirements increase during pregnancy, and the recommended daily intake is about 150 μg. Pregnant women should be aware of their iodine status and intake to prevent complications. Iodized salt is a common and effective way to meet this increased demand, but supplements may be necessary in some cases.

## **Correct Answer:** . 150 μg