This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epilepsy and EEG, Subject name: Medicine
[{'content': 'A child with mental retardation and skin rash on cheeks underwent a CT scan. The diagnosis of the child is? \nSelect and explain. \nA. Tuberous sclerosis, B. Von Hippel Lindau, C. Sturge Weber syndrome, D. Ataxia telangiectasia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In the image on the left adenoma sebaceum is present, which looks like extensive acne in a butterfly distribution. The CT scan head shows a big lesion obliterating the ventricular system. It is a sub-ependymal nodule seen in tuberous sclerosis. A point against Sturge Weber is the absence of cutaneous lesion of Po wine stain. VHL is associated with cerebellar hemangioblastoma.', 'role': 'assistant'}]