The most common location of ventricular septal defect is-: (A) Perimembranous, (B) Muscular, (C) Doubly-committed subaenal, (D) None
Answer is A. The VSD is usually single and situated in the membranous or midmuscular poion of the septum. ( Harrison&;s principle of internal medicine,18th edition,pg no. 1923)