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
Retention of urine in a pregnant woman with retroverted uterus is most commonly seen at: 
Select and explain. 
A. 8-10 weeks, B. 12-16 weeks, C. 20-24 weeks, D. 28-32 weeks
B: 12-16 weeks
Answer: B: 12-16 weeks 
Explanation: Retroverted uterus is present in early weeks of pregnancy (in 15% cases).
Outcome of retroverted uterus in pregnancy:
Mostly 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.