This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'True statement regarding non-coagulase staphylococci 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 staining', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., They commonly infect indwelling prosthesis(Ref: Ananthanarayan, 9th/e, p. 206 and 8th/e, p. 202; Harrison, 18th/e, p. 1167 and 17th/e, p. 878)* Coagulase negative staphylococci (staph epidermidis) has a predilection for growth on the implanted foreign bodies such as artificial heart valves, shunts, intravascular catheters and prosthetic appliances leading to bacteremia.", 'role': 'assistant'}]