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
The most common congenital cardiac lesion identified at bih is 
Select and explain. 
A. ASD, B. VSD, C. PDA, D. Coarctation of Aoa
B: VSD
Answer: B: VSD 
Explanation: Ventricular Septal Defect (VSD) This is the most common congenital cardiac lesion identified at bih accounting for one-quaer of all CHD. VSD is a communication between the two ventricles. 90% are located in the membranous pa of the ventricular septum with variable extension into the muscular septum. Others are located in the muscular septum and can be multiple. Reference: Essential Paediatrics; O.P. Ghai; Page no: 414