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: Surgery
Nosocomial infections are diagnosed after how many hours of hospitalization/ admission? 
Select and explain. 
A. 24 hours, B. 48 hours, C. 72 hours, D. 96 hours
B: 48 hours
Answer: B: 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.