This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pathology
[{'content': 'Koenen&;s tumour is seen in \nSelect and explain. \nA. Tuberous sclerosis, B. Neurofibramatosis, C. VHL syndrome, D. Turcot syndrome', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Tuberous sclerosis is a rare disease that causes tumors, or growths, in the brain and other organs. These growths can occur in the skin, kidneys, eyes, hea, or lungs. They are usually benign (non-cancerous). The first signs of tuberous sclerosismay occur at bih.', 'role': 'assistant'}]