Weight of the placenta and fetus are equal at:
**Core Concept**
At around 20-24 weeks of gestation, the weight of the placenta and the fetus are approximately equal. This phenomenon is due to the rapid growth of the placenta, which matches the growth rate of the fetus during this period.
**Why the Correct Answer is Right**
The placenta grows at an exponential rate, increasing its weight by 10-15 times between 20 and 40 weeks of gestation. This growth is necessary to support the increasing metabolic demands of the fetus. As the placenta grows, it develops a larger surface area for gas exchange, nutrient uptake, and waste removal, ensuring the fetus receives adequate nutrients and oxygen for growth and development.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the phenomenon of equal placental and fetal weight.
**Option B:** This option is incorrect as the equal weight phenomenon occurs before 24 weeks of gestation.
**Option C:** This option is also incorrect as the equal weight phenomenon does not occur after 24 weeks of gestation.
**Clinical Pearl / High-Yield Fact**
It's essential for obstetricians and gynecologists to be aware of the growth patterns of the placenta and fetus throughout pregnancy. This knowledge helps in assessing fetal well-being and detecting potential complications, such as placental insufficiency or fetal growth restriction.
**Correct Answer: C. 24 weeks.**