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': 'Reversal of shunt is not possible in natural history of? \nSelect and explain. \nA. ASD, B. VSD, C. TOF, D. PDA', 'role': 'user'}, {'content': "Answer: C \nExplanation: c. TOF(Ref: Nelson's 20/e p 2211-2217, Ghai 8/e p 420-423)Reversal of shunt or Eisenmenger syndrome is seen in- VSD, ASD, AV canal defect, PDA.", 'role': 'assistant'}]