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': 'Most impoant determinant in Fallot&;s tetralogy is \nSelect and explain. \nA. RVH, B. Sub-pulmonic stenosis, C. Pan systolic murmur, D. Enlargement of hea', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The more severe pulmonary stenosis the shoer the ejection systolic murmur and more the stenosis.Thus the severity of stenosis is directly propoional to severity of pulmonary stenosis ,but the intensity of the systolic murmur is inversely related to the severity of the pulmonary stenosis. Ref : page 420 Ghai pediatrics eighth edition', 'role': 'assistant'}]