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: Pediatrics
[{'content': 'A five day old, full term male infant was severely cyanotic at birth. Prostaglandin E was administered initially and later ballooned atrial septostomy was done which showed improvement in oxygenation. The most likely diagnosis of this infant is – \nSelect and explain. \nA. Tetralogy Fallot, B. Transposition of great vessels, C. Truncus Arteriosus, D. Tricuspid Atresia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Transposition of Great vessels is a condition characterized by aorta arising from the right ventricle and pulmonary artery from the left ventricle.\nThis results in complete separation of systemic and pulmonary circulation. Since systemic and pulmonary circulations are separate, survival depends on mixing of oxygenated pulmonary blood and deoxygenated systemic blood which can occur:\nAt Atrial level\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 : \xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Through ASD\nAt Ventricle level\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 : \xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Through VSD\nAt Great vessel level\xa0\xa0\xa0\xa0 : \xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Through Patent ductus arteriosus\nOxygenation is normal in foetus but after birth as ductus arteriosus closes severe hypoxia occurs and in the\nabsence of VS.D, or ASD child presents with cyanosis and tachypnea at birth.', 'role': 'assistant'}]