This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lymphatic System, Subject name: Surgery
[{'content': 'Most common cause of Lymphedema : \nSelect and explain. \nA. Filariasis, B. Lymph node dissection in malignancies, C. Bacterial infection, D. Congenital', 'role': 'user'}, {'content': 'Answer: A \nExplanation: lymphedema Primary Lymphedema Secondary Lymphedema Occur in 1 of every 1000 individuals At bih, 1 in 6000 persons will develop lymphoedema with an overall prevalence of 0.13-2%. Arise from congenital malformations such as lymphatics More common Filariasis in MC cause worldwide In western countries: Result of neoplasms and their surgical treatments and radiotherapy', 'role': 'assistant'}]