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
The tumour, which may occur in the residual breast; or overlying skin following wide local excision and radiotherapy for mammary carcinoma is: 
Select and explain. 
A. Leiomyosarcoma, B. Squamous cell carcinoma, C. Basal cell carcinoma, D. Angiosarcoma
D: Angiosarcoma
Answer: D: Angiosarcoma 
Explanation: 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.