This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pediatrics
Which one of the following is the common cause of Congenital Hydrocephalus is ? 
Select and explain. 
A. Craniosynostosis, B. Intra uterine Meningitis, C. Aquedectal stenosis, D. Malformations of Great vein of Galen
C: Aquedectal stenosis
Answer: C: Aquedectal stenosis 
Explanation: Aqueductal stenosis is the most common cause of congenital hydrocephalus.