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: Surgery
A neonate presenting with ascites is diagnosed having urinary ascites. What is the most common cause: 
Select and explain. 
A. Bilateral PUJ obstruction, B. Infant polycystic kidney disease, C. Posterior urethral valve, D. Meatal stenosis
C: Posterior urethral valve
Answer: C: Posterior urethral valve 
Explanation: None