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': 'All are major manifestation of theumatic fever and rheumatic hea diease except \nSelect and explain. \nA. Carditis, B. Elevated antiistreptolysin-O, C. Polyahritis, D. Erythema marginatum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Major criteria of RHD include card it is,chorea,ahritis, subcutaneous nodule, erythema marginatum. Ref : Ghai essential of pediatrics, eighth edition ,p.no:436', 'role': 'assistant'}]