This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of skin, Subject name: Dental
Koenen's periungal fibroma is seen in - 
Select and explain. 
A. Tuberous sclerosis, B. Neurofibromatosis, C. Psoriasis, D. Alopecia aerata
A: Tuberous sclerosis
Answer: A: Tuberous sclerosis 
Explanation: periungual fibroma are skin colored papules that grow outwards from the proximal nail fold seen in tuberous sclerosis . page no. 325 Reference Harrison20th edition