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
Most common cause of lymphedema  of upper limb is 
Select and explain. 
A. Filariasis, B. Bacterial infection, C. Congenital, D. Post mastectomy
D: Post mastectomy
Answer: D: Post mastectomy 
Explanation: None