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: Unknown
[{'content': 'Retention of urine in a pregnant women, retroverted uterus is 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 gravid uterus - As a result of retention, the bladder gets distended and becomes an abdominal organ reaching' even up to umbilicus.\nAs pressure from the full bladder increases, small amounts of urine are passed involuntarily, but the bladder never empties entirely - paradoxical incontinence", 'role': 'assistant'}]