This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genitourinary radiology, Subject name: Radiology
[{'content': 'Keyhole Appearence on ultrasound is seen in \nSelect and explain. \nA. Polycystic kidney, B. Hydronephrosis, C. Intracapsular Breast implant rupture., D. Posterior urethral valve', 'role': 'user'}, {'content': 'Answer: D \nExplanation: *Key hole appearance on antenatal scan is a feature of posterior urethral valve *Key hole appearance/linguine sign on breast MRI is a feature of intracapsular Breast implant rupture.', 'role': 'assistant'}]