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
Which of the following causes highest risk of nosocomial infection to a patient 
Select and explain. 
A. Patient admitted for elective surgery, B. HIV patient coming in follow up OPD, C. Patient undergoing endoscopy, D. Patient admitted for normal delivery
A: Patient admitted for elective surgery
Answer: A: Patient admitted for elective surgery 
Explanation: While all hospitalized patients are at risk for HAI, ceain subpopulations are at increased risk. These include the elderly, the immune-compromised, the very young or premature, and burn and surgical patients. Ref: Ananthanarayana & panikers 9th edition