This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Radiology
[{'content': 'True about radiological features of Neurofibromatosis type 1 is all except: \nSelect and explain. \nA. Dural ectasias, B. Empty orbit sign, C. Encephalotrigeminal angiomatosis, D. Superior rib notching', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Encephalotrigeminal angiomatosisEncephalotrigeminal angiomatosis is synonymous with Sturge Weber syndrome, which is characterized by venous angiomas, Port wine stain and tram track gyral calcification in cerebrum.', 'role': 'assistant'}]