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: Pathology
[{'content': 'Tectal breaking is seen in: \nSelect and explain. \nA. Dandy-walker malformation, B. Amold-chiari malformation, C. Aqueductal stenosis, D. Third ventricular tumor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: . Amold-chiari malformation', 'role': 'assistant'}]