**Core Concept**
A simple ovarian cyst in late pregnancy poses a management dilemma due to the potential risks of ovarian torsion and cyst rupture. The primary concern is the safety of both the mother and the fetus.

**Why the Correct Answer is Right**
The best management strategy for a simple ovarian cyst in late pregnancy is removal early in the puerperium (after delivery). This approach minimizes the risk of ovarian torsion and cyst rupture during pregnancy, which can lead to severe consequences for both the mother and the fetus. Early removal also eliminates the need for ongoing surveillance and reduces the risk of complications during labor and delivery. The American College of Obstetricians and Gynecologists (ACOG) recommends that simple ovarian cysts be removed after delivery, if they persist or cause symptoms.

**Why Each Wrong Option is Incorrect**
**Option A:** Emergency laparotomy is not necessary for a simple ovarian cyst in late pregnancy, as it is not an immediate life-threatening condition. This approach would also subject the mother to unnecessary surgical risks.

**Option B:** Waiting 6 weeks after the puerperium to remove the cyst may increase the risk of ovarian torsion and cyst rupture, as the cyst may continue to grow and become more unstable during this time.

**Option D:** Conservative management, relying on the assumption that most tumors would subside, is not a reliable approach. Simple ovarian cysts can persist or grow, and conservative management may lead to delayed diagnosis and treatment of more serious conditions.

**Clinical Pearl / High-Yield Fact**
It is essential to differentiate between simple and complex ovarian cysts. Simple cysts are typically benign and can be managed conservatively, while complex cysts may require surgical intervention due to a higher risk of malignancy.

**✓ Correct Answer: C. Removal early in the puerperium**