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': 'Commonest cause of nosocomial infection is \nSelect and explain. \nA. Pseudomonas, B. Staphylococci, C. Klebsiella, D. Enterobacteriaceae', 'role': 'user'}, {'content': 'Answer: B \nExplanation: According to the CDC, the most common pathogens that cause nosocomial infections are Staphylococcus aureus, Pseudomonas aeruginosa, and E. coli. Some of the common nosocomial infections are urinary tract infections, respiratory pneumonia, surgical site wound infections, bacteremia, gastrointestinal and skin infections. Ref: Ananthanarayana & panikers 10th edition', 'role': 'assistant'}]