## **Core Concept**
The daily requirement of Vitamin A varies across different age groups and is crucial for maintaining vision, immune function, and skin health. Infants have specific nutritional needs, including Vitamin A, to support their rapid growth and development. Vitamin A is essential for the health of the retina, cornea, and skin, as well as for the integrity of the epithelial cells.

## **Why the Correct Answer is Right**
The recommended daily intake of Vitamin A for infants is about 375 micrograms of retinol activity equivalents (RAE). This requirement supports their growth, vision, and immune system development. The RAE is a more specific measure that accounts for the different bioactivities of various Vitamin A compounds.

## **Why Each Wrong Option is Incorrect**
- **Option A:** 100 µg - This amount seems too low for an infant's daily Vitamin A requirement, considering their growth and developmental needs.
- **Option B:** 300 µg - Although closer, it does not match the recommended daily intake for infants.
- **Option D:** 600 µg - This is higher than the recommended daily intake for infants and might be more suitable for adults or children with higher activity levels.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that Vitamin A deficiency can lead to night blindness, and in severe cases, it can cause corneal ulcers and even blindness. Infants and young children are particularly vulnerable to Vitamin A deficiency due to their high demand for growth and limited dietary sources.

## **Correct Answer:** . 375 µg