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': 'Cystic hygroma is \nSelect and explain. \nA. A form of hydrocele, B. A branchial cleft cyst, C. Salivary gland enlargement, D. Lymphangioma', 'role': 'user'}, {'content': "Answer: D \nExplanation: CYSTIC HYGROMA (Cavernous Lymphangioma)\n\nIt is a cystic swelling due to sequestration of a portion of jugular lymph sac from the lymphatic system, during the developmental period in utero.\nPresent at birth and so may cause obstructed labour. Occasionally present in early infancy.\nLymphatics fail to communicate to venous system; abnormal budding of lymphatics is seen.\xa0\xa0\nOften it is associated with Turner’s, Down’s, Klinefelter syndromes and trisomy 18 and 13.\nIt is also called as hydrocoele of the neck.\nLymphatic malformation (LM) type can be microcystic (lymphangioma) or macrocystic (cystic hygroma). It can cause lymphoedema, soft tissue and bony hypertrophy, asymmetry (face), macrochelia, macroglossia, macrotia, cellulitis.\n\n\u200bKey Concept:\n\xa0It\xa0is\xa0a\xa0type\xa0of\xa0congenital\xa0lymphangioma\xa0and\xa0the\xa0common\xa0victims\xa0are infants\xa0and\xa0children.\xa0\nReference: SRB's Manual of Surgery, 5th ed, page no 86, 216, 435", 'role': 'assistant'}]