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
Most common cause of Lymphedema : 
Select and explain. 
A. Filariasis, B. Lymph node dissection in malignancies, C. Bacterial infection, D. Congenital
A: Filariasis
Answer: A: Filariasis 
Explanation: 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