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': 'TSS (Toxic Shock Syndrome) is caused mainly by: \nSelect and explain. \nA. Streptococci, B. Staphylococci, C. Pneumococci, D. Pseudomonas', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Staphylococci', 'role': 'assistant'}]