This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': "What is the ideal method to remove a retained Foley's catheter if its balloon does not deflate? \nSelect and explain. \nA. Over-distend the balloon with water till it bursts, B. Dissolve the balloon by injecting ether, C. CT-guided rupture of balloon, D. USG guided rupture of balloon", 'role': 'user'}, {'content': "Answer: D \nExplanation: The ideal method to remove a retained Foley's catheter if its balloon does not deflate is by USG guided rupture of balloon after inflating it with 20ml water. It should be followed by a cystoscopic examination to rule out any fragments which can lead to bladder stones.", 'role': 'assistant'}]