This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'Most common organism involved in nosocomial infection - \nSelect and explain. \nA. Staph aureus, B. E. coli, C. Legionella, D. Strep pneumonia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: UTI is the most common type of nosocomial infection. . Most common cause of UTI ---> E coli . Most common cause of UTI in ICU ----> Candida . Overall staph aureus is a leading cause of nosocomial infection. . Staph aureus is the most common cause of surgical wound infection - . Most common cause of primary bacteremia --> Coagulase negative staphylococcus. REF : ananthanarayana 10th ed', 'role': 'assistant'}]