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': 'Retention of urine in a pregnant woman with retroverted uterus is most commonly seen at: \nSelect and explain. \nA. 8-10 weeks, B. 12-16 weeks, C. 20-24 weeks, D. 28-32 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Retroverted uterus is present in early weeks of pregnancy (in 15% cases).\nOutcome of retroverted uterus in pregnancy:\nMostly spontaneous rectification occurs by 10–12 weeks. In rare cases fundus fails to clear the promontory of sacrum and becomes impacted in pelvis at 12-14 weeks and blocks the opening of internal urethral sphincter leading to acute retention of urine (at 12-14 weeks) Management is immediate catheterization.', 'role': 'assistant'}]