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': 'Most common cause of breech presentation: \nSelect and explain. \nA. Contrcted pelvis, B. Hydramnios, C. Prematurity, D. Oligohydramnios', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Prematurity', 'role': 'assistant'}]