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': 'Potts shunt is - \nSelect and explain. \nA. Rt subclan aery to pulmonary aery, B. Descending aoa to left pulmonary aery, C. Left subclan to left pulmonary aery, D. Ascending aoa to right pulmonary aery', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Descending aoa with left pulmonary aery", 'role': 'assistant'}]