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': 'Which one of the following is a cyanotic congenital hea disease ? \nSelect and explain. \nA. Patent ductus aeriosus, B. Atrial septal defect, C. Ventricular septal defect, D. Tetralogy of Fallot', 'role': 'user'}, {'content': 'Answer: D \nExplanation: TOF is a cyanotic hea disease. Ref : Ghai essential of pediatrics, eighth edition, p.no:420', 'role': 'assistant'}]