This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Anatomy
[{'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 a inside out turning of the uterus. It is a rare cause of postpaum collapse but collapse occurs suddenly after labour It is acute in onset Mostly uterine inversion is complete, i.e, third degree Most common cause of uterine inversion is mismanagement of third stage of labour Ref: Datta Obs 9e pg 395.', 'role': 'assistant'}]