## **Core Concept**
The detection of a twin pregnancy via ultrasound (USG) in a primigravida (a woman pregnant for the first time) is significant because twin pregnancies are considered high-risk. One of the major complications associated with twin pregnancies is the increased risk of preterm labor. This is due to the overdistension of the uterus, which can stimulate uterine contractions prematurely.

## **Why the Correct Answer is Right**
The correct answer, , is associated with preterm labor, a common complication in twin pregnancies. Preterm labor is labor that begins before 37 weeks of gestation. In twin pregnancies, the risk of preterm labor is significantly higher than in singleton pregnancies. This is because the uterus is more distended, and the increased uterine volume can lead to cervical shortening and early uterine contractions. The risk of preterm labor is a critical concern in the management of twin pregnancies.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because while it might seem related to pregnancy complications, it does not directly relate to a well-known complication specifically associated with twin pregnancies like preterm labor does.
- **Option B:** This option is incorrect because, similar to Option A, it does not directly relate to a commonly recognized complication of twin pregnancies.
- **Option D:** This option is incorrect because it also does not directly relate to a well-recognized complication specifically associated with twin pregnancies.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl for twin pregnancies is that the risk of preterm labor is significantly increased. In fact, more than half of twin pregnancies result in preterm birth. Therefore, close monitoring of cervical length and uterine activity is crucial in the management of twin pregnancies to prevent or delay preterm birth.

## **Correct Answer:** . Preterm labour.