This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Skin
[{'content': "Koenen's periungal fibroma is seen in \nSelect and explain. \nA. Tuberous sclerosis, B. Neurofibromatosis, C. Psoriasis, D. Alopecia aerata", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Tuberous sclerosis', 'role': 'assistant'}]