This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Wide split S2 occurs in: 
Select and explain. 
A. VSD (ventricular septal defect), B. Mitral stenosis, C. ASD (Atrial septal defect), D. c ansd a both
D: c ansd a both
Answer: D: c ansd a both 
Explanation: Answer is C >A (ASD > VSD) Wide physiological splitting may be seen in both VSI) and AS!) but it is more characteristic of ASD. ASD is the single best anterior of choice.