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: Surgery
[{'content': 'Prognosis of carcinoma breast depends on \nSelect and explain. \nA. Lymph node status, B. Size of tumor, C. Skin involvement, D. Peude orange', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ”Metastasis to ipsilateral axillary nodes predicts outcome are surgery more powerfully than tumor size does.\nThe single most important predictor of 10 and 20-year survival rates in breast cancer is the number of axillary lymph nodes involved with metastatic disease.', 'role': 'assistant'}]