**Core Concept**
Docosahexaenoic acid (DHA) is an essential omega-3 fatty acid that plays a crucial role in the growth and development of infants, particularly in the brain and central nervous system (CNS). DHA is a long-chain polyunsaturated fatty acid that is vital for the formation of brain and retina tissue in infants.

**Why the Correct Answer is Right**
DHA is transferred from the mother to the fetus during pregnancy and continues to be present in breast milk, where it supports the rapid growth and development of the infant's brain and CNS. This essential fatty acid is incorporated into brain and retina tissue, facilitating the maturation of neural pathways and the development of cognitive and visual functions. The presence of DHA in breast milk is a key factor in the optimal development of infants, particularly in areas such as cognitive development, language skills, and visual acuity.

**Why Each Wrong Option is Incorrect**
**Option A:** Palmitic acid is a saturated fatty acid that is not directly involved in brain or CNS development. It is primarily a source of energy for the body.
**Option B:** Linoleic acid is an essential omega-6 fatty acid, but it is not as directly involved in brain or CNS development as DHA.
**Option C:** Linolenic acid is an essential omega-3 fatty acid, but it is a precursor to DHA, which is the actual fatty acid responsible for brain and CNS development.

**Clinical Pearl / High-Yield Fact**
It is essential for healthcare providers to advise breastfeeding mothers on the importance of DHA-rich foods in their diet to support optimal infant development. A diet rich in DHA has been shown to have long-term cognitive benefits for infants and may reduce the risk of attention deficit hyperactivity disorder (ADHD) and other developmental disorders.

**✓ Correct Answer: A. Docosahexaenoic acid**