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
Elective cholecystectomy is: March 2013 (a, b, d, e, g) 
Select and explain. 
A. Clean, B. Diy, C. Clean & contaminated, D. Contaminated
C: Clean & contaminated
Answer: C: Clean & contaminated 
Explanation: Ans. C i.e. Clean & contaminated