This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast Cancer - Prognosis and Follow-Up, 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: Ans. is \'a\' i.e.. Lymph node status o "Metastasis to ipsilateral axillary nodes predicts outcome after surgery more powerfully than tumor size does "o "The single most important predictor of 10 and 20 year survival rates in breast cancer is the number of axillary lymphnodes involved with metastatic disease".', 'role': 'assistant'}]