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': 'Risk factor for breech presentation is \nSelect and explain. \nA. Maternal diabetes, B. Oligohydramnios, C. Anterior placental implantation, D. Preeclampsia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Risk factors for breech presentation\n\nOligohydramnios\xa0\nFundal placental implantation\xa0\nPlacenta previa\xa0\nHydrocephaly\nTwin gestation\nAnencephaly\nPrior breech delivery', 'role': 'assistant'}]