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: Surgery
[{'content': 'The tumour, which may occur in the residual breast; or overlying skin following wide local excision and radiotherapy for mammary carcinoma is: \nSelect and explain. \nA. Leiomyosarcoma, B. Squamous cell carcinoma, C. Basal cell carcinoma, D. Angiosarcoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Angiosarcoma(Ref: Sabiston 19/e p845)* Post mastectomy and adjuvant RT results in Lymphedema of Arms.* This lymphedema of upper limb may get converted to lymphangiosarcoma-known as Stewart Treves Syndrome* Treatment - Forequarter amputation.* Has very bad prognosis.', 'role': 'assistant'}]