This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Microbiology
[{'content': 'Most common catheter-related bloodstream infection is \nSelect and explain. \nA. Candida, B. Gram negative organisms, C. Coagulase positive staphylococci, D. Coagulase negative staphylococci', 'role': 'user'}, {'content': 'Answer: D \nExplanation: S.saprophyticus, a coagulase-negative staphylococcus, may be present on the periurethral area and can cause UTI. Ref: Ananthanarayan& Paniker&;s textbook of microbiology, 9th edition. Pg no.206', 'role': 'assistant'}]