This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Surgery
Meningomyelocele patient after being operated developed hydrocephalus due to - 
Select and explain. 
A. Arnold chiari malformation, B. Injury to absorptive surface, C. Central canal injury, D. Arachnoidal block
A: Arnold chiari malformation
Answer: A: Arnold chiari malformation 
Explanation: Meningoceles (or meningomyeloceles) are commonly associated with Arnold Chiari malformation which cause hydrocephalus. Ref : CSDT 13/e p852