This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'Which of the following statement is true about vasa pre \nSelect and explain. \nA. Seen in 1:1500 pregnancies, B. Moality rate is 20% if left undiagnosed, C. Associated with low-lying placenta, D. Cesarean section is indicated', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Vasa pre: Fetal moality is high (50%) due to fetal exsanguination Vaginal bleeding is often associated with fetal distress Unsuppoed umbilical vessels lie below the presenting pa Ref: Dutta Obs 9e pg 243.', 'role': 'assistant'}]