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': "True about primary lymphedema: \nSelect and explain. \nA. Prevalence is 2%, B. Onset b/w 2-35 years indicates lymphedema tarda, C. Onset >35 yrs indicates praecox type, D. Associated with Milroy's disease", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans is d i.e. Associated with Milroy\'s disease "The primary lymphedemas are relatively uncommon, occurring in 1 of every 10,000 individuals"-Sabiston "Lymphangiosarcoma is a rare tumor that develops as a complication of long-standing (usually more than 10 years) lymphedema."- Sabiston "Cutaneous lymphangiosarcoma may develop in chronically lymphedematous extremities."- Devita 8/e Chapter 45', 'role': 'assistant'}]