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
All 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: "The term Nosocomial infection is applied to infection developing in hospitalized patients". These infections neither present nor in incubation, at the time of patient's admission"
Such infections may become evident during their stay in the hospital or sometimes only after their discharge.