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': 'Tram track appearance on CT scan of head is seen in – \nSelect and explain. \nA. Sturge weber syndrome, B. Von Ripple lindau syndrome, C. Tuberous sclerosis, D. Neurofibroma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Train track or rail road calcification is characteristic of sturge weber syndrome.', 'role': 'assistant'}]