This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Vessels, Subject name: Pathology
[{'content': "Milroy's disease is an example of \nSelect and explain. \nA. Primary lymphedema, B. Secondary lymphedema, C. Both, D. None", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) Primary lymphedema(Ref: Harrison 17th ed table 243-3)Causes of lymphedemaPrimarySecondary*. Congenital (includes Milroy's disease)*. Lymphedema praecox (includes Meige's disease)*. Lymphedema tarda*. Recurrent lymphangitis*. Tuberculosis*. Surgery*. Filariasis*. Neoplasm*. Radiation therapy", 'role': 'assistant'}]