This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Antepaum Haemorrhage, Subject name: Gynaecology & Obstetrics
[{'content': 'Fetal blood loss occurs in \nSelect and explain. \nA. Vasa pre, B. Placenta pre, C. Cord prolapse, D. Abruption', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vasa pre occurs when there is velamentous inseion of placenta i.e. the umbilical cord vessels are splitting before getting attached to the placenta. The inseion of the cord may be close to the internal os. The fetal head can compress the cord leading to rupture of vessels. In this case the blood loss occurs from fetal vessels.', 'role': 'assistant'}]