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': 'True about V.S.D. is,all except \nSelect and explain. \nA. Small hole closes spontaneously, B. Defect is usually in membranous pa, C. Endocarditis is commonest complication, D. Pulmonary oligemia in chest X-ray', 'role': 'user'}, {'content': "Answer: D \nExplanation: The VSD is usually single and situated in the membranous or midmuscular poion of the septum. Spontaneous closure is more common in patients born with a small VSD, which occurs in early childhood in most. Main complications are possible development of pulmonary vascular obstruction, RV outflow tract obstruction, aoic regurgitation, or infective endocarditis. (Harrison's Principles of internal medicine, 18 th edition, page 1923 )", 'role': 'assistant'}]