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
True statement regarding non-coagulase staphy lococci is : 
Select and explain. 
A. They are non-pathogenic, B. They commonly infect indwelling prosthesis, C. They may cause scarlet fever, D. They are separated by gram’s staining
B: They commonly infect indwelling prosthesis
Answer: B: They commonly infect indwelling prosthesis 
Explanation: None