This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': "The following is associated with increased risk for :- \nSelect and explain. \nA. Premature rupture of membranes, B. Post paum haemorrhage, C. Fetal exsanguination before labour, D. Fetal NTD's", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Velamentous placenta - The umbilical cord vessels travel within the membrane before reaching placental margin . - Rupture of the membranes involving the overlying vessels lead to vaginal bleeding. - As it is entirely fetal blood, this may result in fetal exsanguination and even death in more than 50% of cases. This condition is actually called \'Vasa pre" when these membraneous vessels overlie the cervical os', 'role': 'assistant'}]