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
All of the following are true about nosocomial infections except 
Select and explain. 
A. May manifest within 48 hours of admission, B. May develop after discharge of patient from the hospital, C. Denote a new condition which is unrelated to the patient's primary conditions, D. May already present at the time of admission
D: May already present at the time of admission
Answer: D: May already present at the time of admission 
Explanation: Nosocomial infection occurs in a patient already suffering from a disease and a new infection is set up from another host or another external source. It occurs 48hours after admission or discharge from the hospital. Ref: Ananthanarayan& Paniker&;s textbook of microbiology, 9th edition. Pg no.71