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': 'Systolic murmur in TOF is due to? \nSelect and explain. \nA. VSD, B. Pulmonary stenosis, C. ASD, D. None', 'role': 'user'}, {'content': "Answer: B \nExplanation: b. Pulmonary stenosis(Ref: Nelson's 20/e p 2223-2225, Ghai 8/e p 424-426)Ejection systolic murmur in TOF is due to pulmonary stenosis.The intensity and duration of this systolic murmur is inversely proportional to the severity of TOF.", 'role': 'assistant'}]