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A 19-year-old patient complains of dyspnea on exertion. He often has bronchitis and pneumonia. Since childhood the patient presents with cardiac murmur. Auscultation revealed splitting of the II sound above the pulmonary artery, systolic murmur in the 3rd intercostal space at the left sternal border. ECG detected right bundle branch block. What is the provisional diagnosis?A.Aortic stenosisB.Atrial septal defectC.AortarctiaD.Open ductus arteriosusE.Mitral insufficiency

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