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: Radiology
[{'content': 'CSF on MRI appears: \nSelect and explain. \nA. Hyperintense on T1 weighed image and hypointense on T2 weighed image, B. Hypointense on T1 weighed image and hyperintense on T2 weighed image, C. Hyperintense on T1 and T2 weighed images, D. Hypointense on T1 and T2 weighed images', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Hypointense on T1 weighed image and hyperintense on T2 weighed image', 'role': 'assistant'}]