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': 'Which of the following step is least useful in the management of TOF: March 2010 \nSelect and explain. \nA. Anastomosis of a systemic aery with pulmonary aery, B. Modified Blalock-Taussig shunt, C. Administer 100% oxygen, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Administer 100% oxygen Palliative treatment consists of anastomosis of a systemic aery with pulmonary aery so as to increase the pulmonary blood flow and thus increase the amount of oxygenated blood reaching the systemic circulation. Definitive treatment consists of Modified Blalock-Taussig shunt, which consists of subclan aery to pulmonary aery anastomosis using a Goretex graft. Humidified oxygen is used only in anoxic spells.', 'role': 'assistant'}]