This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skin Cancer, Subject name: Skin
Koenen's tumor is seen in 
Select and explain. 
A. Ichthyosis, B. Tuberous sclerosis, C. Neurofibromatosis, D. Sturge weber syndrome
B: Tuberous sclerosis
Answer: B: Tuberous sclerosis 
Explanation: Ans- B. Periungual fibromas (Koenen's tumors):- Present in 20% of patients of tuberous sclerosis. Develop in adult life. o Small, pink, sausage-shaped growths arising from under the nail folds; may distort the nail plate.