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: Surgery
[{'content': 'Suppurative osteomyelitis is caused by \nSelect and explain. \nA. Staphylococci, B. Streptococci, C. Streptococci first, later replaced by staphylococci, D. Staphylococci first, later replaced by streptococci', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]