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': 'The most common congenital cardiac lesion identified at bih is \nSelect and explain. \nA. ASD, B. VSD, C. PDA, D. Coarctation of Aoa', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]