This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Placenta - Types and their complications, Subject name: Gynaecology & Obstetrics
Velamentous inseion of the cord is associated with an increased risk for: 
Select and explain. 
A. Maternal hemorrhage prior to delivery, B. Can cause fetal exsanguinations before labor due to blood loss, C. Torsion of the umbilical cord and fetal death, D. Increased fetal malformations incidence
B: Can cause fetal exsanguinations before labor due to blood loss
Answer: B: Can cause fetal exsanguinations before labor due to blood loss 
Explanation: With velamentous inseion of the cord, the umbilical vessels separate in the membranes at a distance from the placental margin, which they reach surrounded only by amnion. It occurs in about 1% of singleton gestations but is quite common in multiple pregnancies. When fetal vessels cross the internal os (vasa pre), rupture of membranes may be accompanied by rupture of a fetal vessel, leading to fetal exsanguination.