**Core Concept**
Asymmetrical Intrauterine Growth Restriction (IUGR) is a condition where the fetus experiences growth restriction due to inadequate placental perfusion, leading to selective growth impairment. This results in a larger head circumference compared to the overall body size, indicating that the brain is relatively spared.

**Why the Correct Answer is Right**
In asymmetrical IUGR, the fetus prioritizes blood flow to the brain, ensuring its development is relatively unaffected. This is because the brain is a high-energy organ that requires a constant supply of oxygen and nutrients. As a result, the head circumference is typically larger than expected for the gestational age, whereas the trunk and limbs are underdeveloped. The kidneys and adrenal glands, which are also high-energy organs, are also relatively spared.

**Why Each Wrong Option is Incorrect**
**Option A:** The liver is not spared in asymmetrical IUGR, as it is a high-energy organ that requires a significant amount of oxygen and nutrients for growth and development.
**Option B:** The pancreas is not specifically spared in asymmetrical IUGR, as its growth is more closely tied to overall fetal growth and development.
**Option C:** The adrenal glands are relatively spared in asymmetrical IUGR, as they are high-energy organs that require a constant supply of oxygen and nutrients for growth and development.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that asymmetrical IUGR is a sign of chronic placental insufficiency, often resulting from maternal hypertension, pre-eclampsia, or other vascular disorders. This condition can lead to long-term neurodevelopmental and cognitive impairments in the fetus.

**Correct Answer:** C. Adrenal glands.