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 ten-year-old boy presents to the pediatric emergency unit with seizures. Blood pressure in the upper extremity measured as 200/140 mm Hg. Femoral pulses were not palpable. The most likely diagnosis amongst the following is: 
Select and explain. 
A. Takayasu aortoarteritis, B. Renal parenchymal disease, C. Grand mal seizures, D. Coarctation of aorta
D: Coarctation of aorta
Answer: D: Coarctation of aorta 
Explanation: d. Coarctation of aorta(Ref: Nelson's 20/e p 2205, Ghai 8/e p 431-433)Isolated upper extremity hypertension (200/140mmHg), together with absent/diminished femoral pulses is a characteristic feature of coarctation of aorta.