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': 'Coast of California sign is seen in - \nSelect and explain. \nA. Neurofibromatosis, B. Fibrous dysplasia, C. Tuberous sclerosis, D. Sturge weber syndrome', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]