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': 'True statement regarding non-coagulase staphy lococci is : \nSelect and explain. \nA. They are non-pathogenic, B. They commonly infect indwelling prosthesis, C. They may cause scarlet fever, D. They are separated by gram’s staining', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]