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: Surgery
In a surgical patient, the causes of non-surgical infection -a) Lower RTIb) Wound infectionc) Clostridium difficile diarrhoead) UTI 
Select and explain. 
A. abc, B. ad, C. acd, D. bde
C: acd
Answer: C: acd 
Explanation: Postoperative patients are at increased risk for a variety of non-surgical postoperative nosocomial infections.
These are:

Urinary tract infection- (Most conunon)
Lower respiratory tract infections-3rd most common (2nd MC cause being surgical site infection (SSI)) LRTI are the leading cause of death d/t nosocomial inf.
Antibiotic-associated diarrhoea, caused by clostridium difficile.
Sinusitis
Meningitis