This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urogenital System, Subject name: Radiology
Investigation of choice for posterior urethral valve is? 
Select and explain. 
A. Micturition cystouretrogram, B. Retrograde urethrography, C. Ultrasound, D. IVP
A: Micturition cystouretrogram
Answer: A: Micturition cystouretrogram 
Explanation: ANSWER: (A) Micturition cystouretrogramREF: Sutton 7th ed page 898, 899"Micturition cystouretrography is the best method to visualize Posterior Urethral valve, VUR and posterior urethraAnterograde techniqueDone with voiding cystouretrogram or excretory urographyBest for evaluating posterior urethraRetrograde techniquesFolder catheter passed through urethra and radio contrast injectedBest for anterior urethra