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': 'A 1–month–old boy is referred for failure to thrive. On examination, he shows feature 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: Feeble femoral pulsations compared to strong brachial pulsations suggests the diagnosis of coarctation of aorta. Hypertension and strong pulsations in the upper extremities and absence, marked dimunition or delay in pulsations in the femoral artery are characteristic in coarctation. Also failure to thrive and congestive heart failure are consistent with the diagnosis of congestive heart failure.\nRemember: \n\nDifferential cyanosis is a manifestation of PDA\nDifferential pulses/Blood pressure is a manifestation of Coarctation', 'role': 'assistant'}]