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
Which of the following is not an appropriate investigation for anterior urethral stricture? 
Select and explain. 
A. Magnetic Resonance Imaging, B. Retrograde urethrogram, C. Micturating cystourethrogram, D. High frequency ultrasound
A: Magnetic Resonance Imaging
Answer: A: Magnetic Resonance Imaging 
Explanation: 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.