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: Ophthalmology
[{'content': 'Which of the following iris lesions is a true tumor \nSelect and explain. \nA. Lisch nodule, B. Koeppe nodule, C. Kundmann - walffian body, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Kunkmann - wolffian body - normal iris stroma\nKoeppe nodule - inflammatory cells.\nLisch nodule - Iris hamartoma associate with neurofibromatosis.', 'role': 'assistant'}]