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': 'Lymph node first involved in Ca breast is /are:\n(A)Axillary\n(B)Internal mammary\n(C)Supraclavicular\n(D)Contralateral axillary \nSelect and explain. \nA. BC, B. CA, C. BC, D. AB', 'role': 'user'}, {'content': "Answer: D \nExplanation: Lymphatic Spread in Carcinoma of Breast Occurs through:\n• Subareolar Sappey's lymphatic plexus\n• Cutaneous lymphatics\n• Inflammatory lymphatics \xa0Lymphatic drainage of the breast is predominantly through axillary (75%).\nPosterior 1/3 rd of the breast are more likely to drain to the internal mammary nodes 1 ,\nInvolvement of supradaviular nodes & of any contralateral lymph nodes represents advanced disease", 'role': 'assistant'}]