This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skin, Subject name: Pathology
Koenen tumor seen in - 
Select and explain. 
A. Neurofibromatosis, B. Tuberous sclerosis, C. Struge weber syndrome, D. Tuberculosis
B: Tuberous sclerosis
Answer: B: Tuberous sclerosis 
Explanation: Ans. is 'b' i.e., Tuberous sclerosis Feriuneual 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.