This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
Surgery for elective hemicolectomy for carcinoma colon is described as 
Select and explain. 
A. Clean, B. Clean contaminated, C. Diy, D. Contaminated
B: Clean contaminated
Answer: B: Clean contaminated 
Explanation: Surgery for elective hemicolectomy for carcinoma colon is described as Clean contaminated.