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
A 1 month old boy is refereed for failure to thrive. On examination, he shows feature of congestive failure. The femoral pulses are feeble as compared to branchial pulses. The most likely clinical diagnosis is 
Select and explain. 
A. Congenital aoic stenosis, B. Coarctation of aoa, C. Patent ductus aeriosus, D. Congenital aooiliac disease
B: Coarctation of aoa
Answer: B: Coarctation of aoa 
Explanation: In coarctation of aoa there will be radiofemoral delay. Ref : Ghai essential of pediatrics, eighth edition, p.no:432