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': 'Obstruction to the flow of CSF at the aqueduct of sylvius will most likely lead to enlargement of: \nSelect and explain. \nA. All of the ventricles, B. Only lateral ventricle, C. Only fouh ventricle, D. Both lateral and third ventricles', 'role': 'user'}, {'content': 'Answer: D \nExplanation: . Both lateral and third ventricles', 'role': 'assistant'}]