Organ which is affected least in IUGR :
**Core Concept**
Intrauterine Growth Restriction (IUGR) refers to a condition where a fetus does not grow at a normal rate inside the womb. This can be due to various factors, including placental insufficiency, maternal health issues, or genetic conditions. The kidneys are a vital organ that plays a crucial role in fetal development.
**Why the Correct Answer is Right**
The kidneys are affected least in IUGR due to their ability to adapt to the reduced oxygen and nutrient supply. The kidneys can compensate for the decrease in blood flow and oxygenation by increasing the expression of hypoxia-inducible factors, which helps to maintain their function. This adaptation allows the kidneys to maintain their function and growth, even in the presence of IUGR. The kidneys also play a role in the regulation of fetal blood pressure, which is essential for maintaining proper blood flow to the placenta.
**Why Each Wrong Option is Incorrect**
* **Option A:** The liver is not affected least in IUGR. The liver's growth and function can be impaired due to the reduced oxygen and nutrient supply, leading to changes in fetal metabolism and liver function.
* **Option B:** The pancreas is not affected least in IUGR. The pancreas plays a crucial role in fetal glucose homeostasis, and its function can be impaired due to the reduced oxygen and nutrient supply, leading to changes in fetal glucose levels.
* **Option D:** The brain is not affected least in IUGR. The brain is a sensitive organ that can be affected by the reduced oxygen and nutrient supply, leading to changes in fetal development and potential long-term neurological consequences.
**Clinical Pearl / High-Yield Fact**
Fetal kidneys are able to adapt to the reduced oxygen and nutrient supply in IUGR by increasing the expression of hypoxia-inducible factors, which helps to maintain their function and growth.
**Correct Answer:** C.