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': 'Battledore placenta is associated with highest risk of \nSelect and explain. \nA. Fetal anomalies, B. Cord avulsion, C. Uterine inversion, D. Single umbilical artery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Battle dore placenta - marginal insertion of umbilical cord, occasionally results in cord avulsion during delivery of placenta.', 'role': 'assistant'}]