**Core Concept**
The third stage of labor is a critical period in the postpartum phase, involving the delivery of the placenta and uterine contractions to prevent excessive bleeding. Various interventions can be applied during this stage to facilitate placental delivery and promote uterine involution.

**Why the Correct Answer is Right**
IV methergin is a synthetic analogue of methylergonovine, an ergot alkaloid that causes sustained uterine contractions. It is typically administered after the delivery of the baby to reduce the risk of postpartum hemorrhage. However, IV methergin is not used during the third stage of labor, as it is contraindicated in this context due to the risk of severe hypertension and uterine atony. The correct management of the third stage involves controlled cord traction, uterine massage, and the administration of oxytocin to stimulate uterine contractions.

**Why Each Wrong Option is Incorrect**
**Option A:** Controlled cord traction is a fundamental component of the third stage of labor, as it helps to facilitate placental delivery and prevent excessive bleeding.
**Option B:** IM oxytocin is often administered during the third stage of labor to stimulate uterine contractions and prevent postpartum hemorrhage.
**Option D:** Uterine massage is also a critical component of the third stage of labor, as it helps to stimulate uterine contractions and promote uterine involution.

**Clinical Pearl / High-Yield Fact**
It is essential to note that IV methergin is contraindicated in the third stage of labor due to the risk of severe hypertension and uterine atony. In contrast, oxytocin and controlled cord traction are essential components of the third stage of labor to prevent postpartum hemorrhage.

**Correct Answer:**
✓ Correct Answer: C. IV methergin