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
Milroy's disease is an example of 
Select and explain. 
A. Primary lymphedema, B. Secondary lymphedema, C. Both, D. None
A: Primary lymphedema
Answer: A: Primary lymphedema 
Explanation: 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