## **Core Concept**
The question focuses on the nutritional components of breast milk, specifically fatty acids, and their role in infant growth and central nervous system (CNS) development. Breast milk contains various fatty acids crucial for infant development.

## **Why the Correct Answer is Right**
The correct answer, **DHA (Docosahexaenoic acid)**, is an omega-3 fatty acid that plays a significant role in brain and eye development. DHA is highly concentrated in the brain and retina, making it essential for cognitive and visual development. Studies have shown that DHA supports the growth and functional development of the infant's brain and eyes.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While palmitic acid is a common saturated fatty acid in breast milk and important for energy, it does not specifically support CNS development like DHA.
- **Option B:** Linoleic acid, an omega-6 fatty acid, is crucial for infant growth but does not directly contribute to CNS development as much as DHA.
- **Option C:** Arachidonic acid (ARA) is another fatty acid found in breast milk and is important for infant development, including the brain and eyes. However, DHA has a more pronounced effect on CNS development.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **DHA supplementation in pregnant and lactating women can support fetal and infant brain and eye development**. This highlights the importance of maternal nutrition during pregnancy and lactation for optimal infant development.

## **Correct Answer:** D. DHA.