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
[{'content': 'Most common cause of lymphedema  of upper limb is \nSelect and explain. \nA. Filariasis, B. Bacterial infection, C. Congenital, D. Post mastectomy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]