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': 'Which of the following is not an appropriate investigation for anterior urethral stricture ? \nSelect and explain. \nA. Magnetic resonance imaging, B. Retrograde urethrogram, C. Micturating cystourethrogram, D. High frequency ultrasound', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Radiological investigations for urethral stricture are :-\n\t(1) Retrograde urethrography;\xa0\n\t(2) Micturating cystourethrography;\xa0\n\t(3) Endoscopy (urethroscopy);\xa0\n\t(4)\xa0Sonographic urethrogram;\xa0\n\t(5) High frequency USG.', 'role': 'assistant'}]