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: Surgery
[{'content': 'Which of the following is not a feature of normal pressure hydrocephalus: September 2011 \nSelect and explain. \nA. Affects elderly usually, B. Ventriculomegaly on imaging studies, C. Measurement of CSF pressure may be normal, D. Lesion is blockage of CSF pathways from the lateral to fouh ventricle', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Lesion is blockage of CSF pathways from the lateral to fouh ventricle Although one-off measurement of CSF pressure may be normal the syndrome is thought to arise from impaired CSF absorption', 'role': 'assistant'}]