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
Wide fixed splitting of the second hea sound is typical of- 
Select and explain. 
A. Atrial septal defect, B. Ventricular septal defect, C. Patent ductus aeriosus, D. Coarctation of aoa
A: Atrial septal defect
Answer: A: Atrial septal defect 
Explanation: 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