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': 'A child after 4 weeks of bih acyanotic, ejection systolic murmur detected causes are/is ___________ \nSelect and explain. \nA. VSD, B. PDA, C. TOF, D. Coaation of aoa', 'role': 'user'}, {'content': 'Answer: A \nExplanation: VSD is the most common CHD (1/4) presents with ejection systolic murmur at pulmonary valve& palpable thrill. Ref : Ghai essential of pediatrics, eighth edition, p.no:414', 'role': 'assistant'}]