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': 'Which among the following is common cause for transverse lie \nSelect and explain. \nA. Prolonged labor, B. Nulliparity, C. Placenta previa, D. Oligohydramnios', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Most common causes of transverse lie are:\n\nMultiparity\nPreterm fetus\nAbnormal uterine anatomy\nHydramnios\nContracted pelvis.', 'role': 'assistant'}]