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': 'The following statements are related to obstetric inversion: \nSelect and explain. \nA. It is usually insidious in onset, B. It is usually acute, C. It is usually incomplete, D. In majority, it is spontaneous in nature', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Uterine inversion is a condition in which there is inside out turning of the uterus.\nIt is a rare cause of postpartum collapse but collapse occurs suddenly after labour.\nIt is acute in onset.\nMostly uterine inversion is complete i.e. of third degree\nMost common cause of uterine inversion is mismanagement of the third stage of labour\nSpontaneous inversion can occur with an atonic uterus (in 40% cases).\nPlacenta accreta is a rare cause of uterine inversion.', 'role': 'assistant'}]