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': 'Differential cyanosis occurs in which disease \nSelect and explain. \nA. Severe caorctation, B. Inturrupted aoic arch, C. PPHN, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Blood flow to lower extremities decrease in PPHN,coarctation of aoa, interrupted aoic arch. Ref : Ghai essential of pediatrics, eighth edition, p.no:432', 'role': 'assistant'}]