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: Pediatrics
[{'content': 'A 1-month-old boy is referred for failure to thrive. On examination, he shows features of congestive failure. The femoral pulses are feeble as compared to brachial pulses. The most likely clinical diagnosis is: \nSelect and explain. \nA. Congenital aortic stenosis, B. Coarctation of aorta, C. Patent ductus arteriosus, D. Congenital aortoiliac disease', 'role': 'user'}, {'content': "Answer: B \nExplanation: b. Coarctation of aorta(Ref: Nelson's 20/e p 2205, Ghai 8/e p 413-433)Feeble femoral pulsations compared to strong brachial pulsations suggests of coarctation of aorta.", 'role': 'assistant'}]