This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': "Inferior rib notching is present in \nSelect and explain. \nA. TAPVC, B. Coarctation of aorta, C. Fallot's tetralogy, D. Ventricular septal defect", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Causes of rib notching ae: - A) Inferior surface\n1) Arterial\ni) Coarctation of aorta Bilateral Rib notching is seen on the lower border of 3 rd to 8th ribs. Rib notching is absent in the 1st & 2nd ribs. Rib notching is usually present after the age of 7 years.\nii) Aortic thrombosis (aortic obstruction) or aortitis.\niii) Subclavian obstruction after Blalock operation for Fallot’s tetralogy (Taussig Blalock operation).\niv) Pulmonary oligemia Pulmonary atresia,\n1)TOF, absent pulmonary artery.\n2) Venous : - SVC obstruction\n3) Arteriovenous : - Pulmonary arteriovenous malformation, chest wall arteriovenous malformation.\n4) Neurogenic : - Neurofibromatosis.\nB) Superior surface\n1) Connective tissue diseases: - SLE, Scleroderma, RA, Sjogren’s syndrome.\n2) Metabolic : - Hyperparathyroidism\n3) Miscellaneous : - Neurofibromatosis, Restrictive lung disease, Poliomyelitis, Marfan’s syndrome, progeria, Osteogenesis imperfecta.', 'role': 'assistant'}]