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
Systolic murmur in TOF is due to ? 
Select and explain. 
A. VSD, B. Pulmonary stenosis, C. ASD, D. None
B: Pulmonary stenosis
Answer: B: Pulmonary stenosis 
Explanation: Ejection systolic murmur in TOF is due to pulmonary stenosis. Ref : Ghai essential of pediatrics, eighth edition, p.no:420