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 associated with- 
Select and explain. 
A. Tuberous sclerosis, B. Neurofibromatosis, C. Psoriasis, D. Alopecia aerata
A: Tuberous sclerosis
Answer: A: Tuberous sclerosis 
Explanation: Ans. is 'a' i.e., Tuberous sclerosis o Koenen's periungual fibroma is seen in tuberous sclerosis.