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': 'Vesicoureteric reflux is best demonstrated by: \nSelect and explain. \nA. Intravenous pyelography, B. Micturating cystourethrogram, C. Retrograde pyelography, D. Isotope renography', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Micturating cystourethrogram', 'role': 'assistant'}]