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: Gynaecology & Obstetrics
[{'content': 'Cephalhematoma: \nSelect and explain. \nA. Is caused by oedema of the subcutaneous layers of the scalp, B. Should be treated by aspiration, C. Most commonly lies over the occipital bone, D. Does not vary in tension with crying', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cephalhaematoma:\n\nCollection of blood in between the pericranium and the flat bone of the skull due to rupture of a small emissary vein from the skull. It may be associated with fracture of the skull bone.\nUsually unilateral.\nLies over a parietal bone.\nCaused generally by forceps delivery but may also be met with following a normal labour.\nVentouse application does not increase the incidence of cephalhaematoma.\nIt is never present at birth but gradually develops after 12-24 hours of birth and disappears by 6-8 weeksQ.\nIt is circumscribed, soft, fluctuant, and incompressible.\nThe swelling is limited by the suture lines of the skullQ as the pericranium is fixed to the margins of the bone.\nNo active treatment is necessary.\nPrognosis is good.\n\nMeningocele always lies over a suture line or fontanelle and there is impulse on crying.', 'role': 'assistant'}]