This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous System, Subject name: Pathology
[{'content': "Koener's tumor are seen in? \nSelect and explain. \nA. Tuberous sclerosis, B. Neurofibromatosis, C. VHL, D. NF", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) Tuberous sclerosis(Ref: Robbins 9th/pg 516)Ungual fibromas or Koenen's tumors are angiofibromas which occur in the lateral nail groove, along the proximal nail fold or under the nail. They are seen in Tuberous Sclerosis", 'role': 'assistant'}]