**Core Concept**
At term, the placenta plays a vital role in providing oxygen and nutrients to the fetus while removing waste products. The placental weight to fetal weight ratio is an important indicator of placental function and fetal well-being.

**Why the Correct Answer is Right**
The normal placental weight to fetal weight ratio at term is approximately 1:6. This means that for every 1 gram of placental weight, there are 6 grams of fetal weight. This ratio is crucial as it reflects the efficiency of placental function in supporting fetal growth and development. The placenta provides oxygen and nutrients to the fetus through the process of diffusion, facilitated by the presence of a rich network of capillaries. The correct ratio ensures optimal exchange of gases and nutrients, which is essential for fetal health.

**Why Each Wrong Option is Incorrect**
**Option A:** A ratio of 1:4 would indicate inadequate placental function, leading to potential fetal growth restriction and increased risk of perinatal morbidity and mortality.

**Option B:** A ratio of 1:5 is closer to the normal range but still slightly lower than the ideal ratio of 1:6, which may compromise fetal growth and development.

**Option D:** A ratio of 1:7 would be significantly lower than the normal range, suggesting severe placental insufficiency and potential fetal compromise.

**Clinical Pearl / High-Yield Fact**
A key clinical correlation to remember is that a low placental weight to fetal weight ratio at term is associated with an increased risk of perinatal complications, including fetal growth restriction and preterm birth.

**✓ Correct Answer: C. 1:06**