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 cystic hygroma except ? \nSelect and explain. \nA. Aspiration is diagnostic, B. 50% present at bih, C. Presents as posterior cervical swelling, D. Sequstration of lymphatic tissue', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer is (a) i.e. Aspiration is diagnostic Sabiston writes "Roughly 50% to 65% of hygromas prsent at bih, with most becoming apparent by the second year of life." About option \'a\' - I have looked in Schwaz, Sabiston, CSDT, Nelson & Bailey. Nowhere its written that aspiration is needed for diagnosis.', 'role': 'assistant'}]