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: Medicine
Arnold-Chiari malformation-All are true except- 
Select and explain. 
A. Cerebellomedullary malformation, B. Almost always associated with severe spina bifida, C. There is obstruction to the flow of CSF, D. 4th ventricle lies above the level of formen magnum
D: 4th ventricle lies above the level of formen magnum
Answer: D: 4th ventricle lies above the level of formen magnum 
Explanation: None