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: Radiology
[{'content': 'Micturating cystourethrogram is not used in: \nSelect and explain. \nA. Renal tumours, B. Hydronephrosis, C. Urinary obstruction, D. Recurrent UTI', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Renal tumours', 'role': 'assistant'}]