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': 'Under the Jones criteria, which one of the following is a major criterion for the diagnosis of acute rheumatic fever? \nSelect and explain. \nA. Elavated acute -phase reactants, B. Elevated ASO titer, C. Increased PR interval, D. Carditis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Carditis is a jones major criteria. Ref : Ghai essential of pediatrics, eighth edition, p.no:434', 'role': 'assistant'}]