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
Koenen's periungual fibromas are seen in > 50% of cases with – 
Select and explain. 
A. Tuberous sclerosis, B. Sturge weber syndrome, C. Alaxia telangiectasia, D. Neurofibroatosis
A: Tuberous sclerosis
Answer: A: Tuberous sclerosis 
Explanation: Periungual fibromas (koenen's tumor) is seen in 20% of patients of tuberous sclerosis.