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: Dental
[{'content': "Koenen's periungual fibromas are seen in > 50% of cases with – \nSelect and explain. \nA. Tuberous sclerosis, B. Sturge weber syndrome, C. Alaxia telangiectasia, D. Neurofibroatosis", 'role': 'user'}, {'content': "Answer: A \nExplanation: Periungual fibromas (koenen's tumor) is seen in 20% of patients of tuberous sclerosis.", 'role': 'assistant'}]