**Core Concept**
Fetal alcohol syndrome (FAS) is a condition that occurs when a fetus is exposed to alcohol in the womb, leading to physical, behavioral, and learning problems. The exact mechanisms of FAS involve the disruption of normal fetal development, particularly in the brain and nervous system.

**Why the Correct Answer is Right**
Fetal alcohol syndrome is characterized by a range of features, including growth restriction, facial abnormalities (such as a thin upper lip and a smooth philtrum), and central nervous system dysfunction. Children with FAS may also experience cognitive impairment, behavioral problems, and difficulties with learning and memory. The exact mechanisms of FAS involve the disruption of normal fetal development, particularly in the brain and nervous system.

**Why Each Wrong Option is Incorrect**
**Option A:** Growth restriction is a feature of FAS, so this option is incorrect.
**Option B:** Facial abnormalities are a hallmark of FAS, making this option incorrect as well.
**Option C:** Central nervous system dysfunction, including cognitive impairment and behavioral problems, is a key feature of FAS, so this option is also incorrect.

**Clinical Pearl / High-Yield Fact**
It's essential to note that Fetal Alcohol Spectrum Disorders (FASD) is a broader term that encompasses a range of effects caused by prenatal alcohol exposure, including Fetal Alcohol Syndrome, Fetal Alcohol Effects, and other related conditions.

**Correct Answer: D.**