This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
Most common site of lymphangiosarcoma is 
Select and explain. 
A. Liver, B. Spleen, C. Retroperitoneum, D. Post mastectomy arm
D: Post mastectomy arm
Answer: D: Post mastectomy arm 
Explanation: Most common site of lymphangiosarcoma is arm following mastectomy, Occurs commonly after radical lymph nodes dissection- stewa treves syndrome Reference- SRB - 5th edition, sarcoma, page 311.