This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'American Heart Association standard pediatric dose of amoxicillin for antibiotic prophylaxis, in cases of endocarditis is \nSelect and explain. \nA. 20mg/kg, B. 50mg/kg, C. 100mg/kg, D. 125mg/kg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]