This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Medicine
Nosocomial infection is called after how many hours of hospital admission? 
Select and explain. 
A. 12 hours, B. 24 hours, C. 48 hours, D. 72 hours
C: 48 hours
Answer: C: 48 hours 
Explanation: Nosocomial infections Defined as those infections occurring within 48 hours of hospital admission, 3 days of discharge or 30 days of an operation. Gram-positive bacteria are the commonest cause of nosocomial infections withStaphylococcus aureusbeing the predominant pathogen. Hospital-acquired pneumonia-Defined as pneumonia that occurs 48 hours or more after admission and did not appear to be incubating at the time of admission. Ventilator-associated pneumonia-Defined as pneumonia that develops more than 48 to 72 hours after endotracheal intubation.