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
Tram track appearance on CT scan of head is seen in – 
Select and explain. 
A. Sturge weber syndrome, B. Von Ripple lindau syndrome, C. Tuberous sclerosis, D. Neurofibroma
A: Sturge weber syndrome
Answer: A: Sturge weber syndrome 
Explanation: Train track or rail road calcification is characteristic of sturge weber syndrome.