This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
Elective cholecystectomy is which type of surgery? 
Select and explain. 
A. Clean contaminated, B. Clean, C. Diy, D. Contaminated
A: Clean contaminated
Answer: A: Clean contaminated 
Explanation: Clean No viscus opened Thyroid, Breast surgeries Clean-contaminated Viscus opened, minimal spillage Cholecystectomy, Gastric surgery Contaminated Open viscus with spillage or inflammatory disease Inflamed appendix, Rectal surgeries Diy Pus or perforation, or incision through an abscess I&d wound debridement