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': 'Causes of wide fixed splitting of second heart sound include all except: \nSelect and explain. \nA. Atrial septal defect, B. Ebstein anomaly, C. Total anomalous pulmonary venous return, D. Right bundle branch block', 'role': 'user'}, {'content': "Answer: B \nExplanation: b. Ebstein anomaly(Ref: Nelson's 20/e p 2190)Wide fixed splitting of second heart sound is seen in Atrial septal defect, Total anomalous pulmonary venous return (TAPVC) and Right bundle branch block (RBBB)", 'role': 'assistant'}]