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
[{'content': 'Meningomyelocele patient after being operated developed hydrocephalus due to - \nSelect and explain. \nA. Arnold chiari malformation, B. Injury to absorptive surface, C. Central canal injury, D. Arachnoidal block', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Meningoceles (or meningomyeloceles) are commonly associated with Arnold Chiari malformation which cause hydrocephalus. Ref : CSDT 13/e p852', 'role': 'assistant'}]