单项选择题

Distinguish normal and abnormal pulmonary vascular patterns on the chest film. These four patients all have the same condition.What is it?()

A.Normal
B.Ventricular septal defect with normal pulmonary blood flow
C.Atrial septal defect with increased pulmonary blood flow
D.Chronic pulmonary emboli
E.Left ventricular failure with pulmonary venous hypertension
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