This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'What is the most common microorganism found in pediatric subacute infec ve endocarditis? \nSelect and explain. \nA. Staph aureus, B. Strep viridans, C. E. coli, D. Pneumococci', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]