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': "A 2 year old child with a known history of rheumatic heart disease presents with a 3 weeks history of fever with palpitations. Most likely cause is: \nSelect and explain. \nA. Kawasaki's disease, B. Collagen vascular disease, C. Staphylococcal endocarditis, D. None of these", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Staphylococcal endocarditisHistory of prolonged fever in a child with a previous history of heart disease should always raise suspicion of infective endocarditis. Since Staphylococcus is the most important cause, the best answer here should be Staphylococcal endocarditis', 'role': 'assistant'}]