This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Lymphatic System), Subject name: Surgery
[{'content': 'Most common type of primary lymphedema is? \nSelect and explain. \nA. Lymphedema congenital, B. Lymphedema precox, C. Lymphedema tarda, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ANSWER: (B) Lymphedema precoxREF: Sabiston 18\'h edition chapter 69, style="color: rgba(0, 0, 0, 1); font-family: Times New Roman, Times, serif"> primary_lymphedema.htm\' The most common form of primary lymphedema is praecox, which accounts for about 80% of the patients. Congenital and tarda lymphedemas each account for the remaining 10%"', 'role': 'assistant'}]