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
Common source of staph in hospital : 
Select and explain. 
A. IV fluids, B. Infective wounds, C. Instruments, D. Bed linen
B: Infective wounds
Answer: B: Infective wounds 
Explanation: MC mode of spread of S. aureus infection is via hands of health care workers.
S. aureus is MC cause of surgical wound infection and can cross infect wound of other patient too.
Most effective mode of prevention of nosocomial S. aureus infection is hand washing.