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: Medicine
[{'content': 'What is NOT a feature of Sturge Weber syndrome - \nSelect and explain. \nA. Rail track appearance, B. Hemiatrophy of the brain, C. Convulsion, D. Empty sella', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]