This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors of Nervous System, Subject name: Medicine
Koenen's tumor are seen in? 
Select and explain. 
A. Neurofibromatosis, B. Tuberous sclerosis, C. Sturge weber syndrome, D. Tuberculosis
B: Tuberous sclerosis
Answer: B: Tuberous sclerosis 
Explanation: Ans. (b) Tuberous sclerosisRef : Dermatology by Otto Braun falco p 846, Harrison' internal medicine 18/e, chapter 53, p 410