This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
Koenen's tumor are seen in ? 
Select and explain. 
A. Neurofibromatosis, B. Tuberous sclerosis, C. Struge weber syndrome, D. Tuberculosis
B: Tuberous sclerosis
Answer: B: Tuberous sclerosis 
Explanation: Koenen tumors, or periungual and subungual fibromas, are a benign, cutaneous manifestation of tuberous sclerosis. They are disfiguring, painful, and challenging to treat as they frequently recur . Koenen's tumor is a cutaneous condition that results in fifty percent of tuberous sclerosis cases. Ref - Davidson 23rd edition pg 838