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': 'Widely split S1 is heard in \nSelect and explain. \nA. Right bundle branch block (RBBB), B. Mitral regurgitation (MR), C. Atrial septal defect (ASD), D. Ventricular septal defect (VSD)', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In ASD there Will be widely fixed split S2. Ref : Ghai essential of pediatrics, eighth edition, p.no:413', 'role': 'assistant'}]