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': 'Epidermoids can be differentiated from arachnoid cyst on MRI by: \nSelect and explain. \nA. Contrast enhancement, B. Smooth margins, C. Restricted diffusion, D. CSF signal on FLAIR', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Restricted diffusion Epidermoids can be differentiated from arachnoid cyst characteristically by hyper-intense diffusion weighted images because of restricted diffusion of epidermoid cystQ. FLAIR and proton images are less specific than DWI.', 'role': 'assistant'}]