This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'Fetal blood loss occurs in : \nSelect and explain. \nA. Uterine rupture, B. Placenta pre, C. Vasa pre, D. Circumvallate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vasa pre', 'role': 'assistant'}]