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: Pediatrics
Commonest cause of non–communicating hydrocephalus in children is – 
Select and explain. 
A. Congenital anomaly, B. Perinatal injury, C. Post–inflammatory obstruction, D. Brain tumors
A: Congenital anomaly
Answer: A: Congenital anomaly 
Explanation: Hydrocephalus 

Hydrocephalus is characterized by an increased volume of CSF in association with progressive ventricular dilatation.