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': 'All are true about congenital lymphedema except? \nSelect and explain. \nA. It is bilateral, B. Involve lower limb, C. Almost always manifests before pubey, D. None', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'None' Primary lymphedema has been classified on the basis of the age at onset and presence of familial clustering. a) Congenital lymphedema - has onset before the 1st year of life (according to Schwaz and Bailey onset is - congenital lymphedema can involve a single lower extremity, multiple limbs, the genitalia or the face (it is more likely to be bilateral & involve whole leg) the familial version of congenital lymphedema is k/a Milroy's ds. b) Lymphedema praecox primary lymphedema with onset b/w the age of 1 and 35 yrs is called lymphedema praecox this is the most common form of primary lymphedema accounting for 90% of cases praecox is far more common in women (10:1) - praecox lymphedema more likely to be unilateral and usually extends only to the knees (i.e. involves foot & calf) the familial version of lymphedema praecox is k/a Meige's ds. c) Lymphedema tarda primary lymphedema with onset after the age of 35 yrs is called lymphedema tarda", 'role': 'assistant'}]