This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pediatrics
[{'content': 'In which of the following differential cyanosis found ? \nSelect and explain. \nA. VSD with reversal of shunt, B. PDA with reversal of shunt, C. ASD with reversal of shunt, D. Tetralogy of Fallot', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In PDA the shunt is between pulmonary aery and aoa distal to subclan aery resulting in differential cyanosis. Ref : Ghai essential of pediatrics, eighth edition, p.no:417', 'role': 'assistant'}]