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': 'Urinary incontinence in uterovaginal prolapse is mostly is due to : \nSelect and explain. \nA. Detrusor instability, B. Stress incontience, C. Urge incontinence, D. True incontinence', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Stress incontience', 'role': 'assistant'}]