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
[{'content': 'The most common location of ventricular septal defect is- \nSelect and explain. \nA. Perimembranous, B. Muscular, C. Doubly-committed subaenal, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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)', 'role': 'assistant'}]