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
[{'content': 'Elective cholecystectomy is: March 2013 (a, b, d, e, g) \nSelect and explain. \nA. Clean, B. Diy, C. Clean & contaminated, D. Contaminated', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C i.e. Clean & contaminated', 'role': 'assistant'}]