This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Pathology
[{'content': 'The most common site for lymphagiosarcoma is \nSelect and explain. \nA. Liver, B. Spleen, C. Post mastectomy arm, D. Retroperitoneum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Post mastectomy arm(Ref: Cancer 1948; 1:64-81)*Lymphangiosarcoma is a misnomer because this malignancy seems to arise from blood vessels instead of lymphatic vessels.*Most commonly, this tumor is a result of lymphedema induced by radical mastectomy*Stewart-Treves syndrome is a rare, cutaneous angiosarcoma that develops in long-standing chronic lymphedema.', 'role': 'assistant'}]