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: Medicine
[{'content': 'Wide fixed splitting of the second hea sound is typical of- \nSelect and explain. \nA. Atrial septal defect, B. Ventricular septal defect, C. Patent ductus aeriosus, D. Coarctation of aoa', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Wide fixed split of S2 is seen in ASD. Wide split : VSD, MR, LV pacemaker, WPW, PS, RVF, RBBB. Reverse split : RV pacemaker, WPW, Eisen menkers, AS, LVF, LBBB, TR Ref: Harrison&;s 20th ed', 'role': 'assistant'}]