This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': 'Shagreen patch is seen in- \nSelect and explain. \nA. Tuberous sclerosis, B. Neurofibromatosis, C. Sturge weber syndrome, D. Neurofibromatosis I', 'role': 'user'}, {'content': 'Answer: A \nExplanation: . *In tuberous sclerosis skin changes include ash leaf mailed,angiofibromas, adenoma sebaceum, shagreen patches often on lower back. Ref Harrison20th edition pg 2564', 'role': 'assistant'}]