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
[{'content': "Koenen's tumor is seen in \nSelect and explain. \nA. Ichthyosis, B. Tuberous sclerosis, C. Neurofibromatosis, D. Sturge weber syndrome", 'role': 'user'}, {'content': "Answer: B \nExplanation: 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.", 'role': 'assistant'}]