## **Core Concept**
The recommended daily intake of iodine varies across different populations, including pregnant and lactating women, due to increased demands. Iodine is crucial for thyroid hormone production, which is essential for fetal and infant growth and development. Lactating women require adequate iodine to ensure their milk contains sufficient iodine for the baby's needs.

## **Why the Correct Answer is Right**
Lactating women have a higher requirement for iodine compared to non-pregnant, non-lactating women. The World Health Organization (WHO) and other health institutions recommend that lactating women consume 290 micrograms (mcg) of iodine per day. This increased requirement is to compensate for the iodine secreted in breast milk, ensuring that the nursing infant receives adequate iodine for thyroid function and growth.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not specify a value, making it impossible to assess its accuracy.
- **Option B:** Similarly, this option lacks a specific value and cannot be evaluated.
- **Option D:** This option also does not provide a specific value, rendering it incorrect as it cannot be considered a valid recommendation.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that iodine deficiency during lactation can lead to hypothyroidism in the mother and potentially affect the infant's cognitive and motor development. Iodine supplementation for lactating women is often recommended, especially in areas where dietary iodine intake is low.

## **Correct Answer:** C. 290 mcg.