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
[{'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: periungual fibroma are skin colored papules that grow outwards from the proximal nail fold seen in tuberous sclerosis . page no. 325 Reference Harrison20th edition', 'role': 'assistant'}]