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': 'lncontinence in elderly female b most commonly due lo : \nSelect and explain. \nA. Detrusor instability, B. True stress incontinence, C. Vesicovaginal fistule, D. Outlet obstruction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Detrusor instability', 'role': 'assistant'}]