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
[{'content': 'Surgery for elective hemicolectomy for carcinoma colon is described as \nSelect and explain. \nA. Clean, B. Clean contaminated, C. Diy, D. Contaminated', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Surgery for elective hemicolectomy for carcinoma colon is described as Clean contaminated.', 'role': 'assistant'}]