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: Microbiology
[{'content': 'Common inhabitant of throat and tonsils is \nSelect and explain. \nA. Alpha hemolytic streptococci (S. viridans), B. Staphylococci, C. Beta hemolytic streptococci, D. Pneumococci', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]