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: A i.e. MRI Radiological Investigation for urethral stricture Retrograde urethrographyQ -It should not be done within 3-4 weeks of significant urethral trauma (can cause extravasation of the dye into the spongy tissue, lymphatics & veins of pelvis). -Mainstay of investigation.', 'role': 'assistant'}]