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: Radiological investigations for urethral stricture are :-
	(1) Retrograde urethrography; 
	(2) Micturating cystourethrography; 
	(3) Endoscopy (urethroscopy); 
	(4) Sonographic urethrogram; 
	(5) High frequency USG.