This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Pediatrics
[{'content': 'A 10 year old boy presents to the pediatric emergency unit with seizures. Blood pressure in the upper extremity is measured as 200/140 mm Hg. Femoral pulses were not palpable. The most likely diagnosis is: \nSelect and explain. \nA. Grandmal seizures, B. Coarctation of aorta, C. Renal parenchymal disease, D. Takayasu aorto arteritis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Coarctation of aortaIsolated upper extremity hypertension with absent or diminished femoral pulses clearly suggest the diagnosis of Coarctation of aorta.', 'role': 'assistant'}]