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': 'Which one of the following surgical procedures is considered to have a clean-contaminated wound ? \nSelect and explain. \nA. Elective open cholecystectomy for cholelithiasis, B. Herniorrhaphy with mesh repair, C. Herniorrhaphy with mesh repair, D. Appendectomy with walled off abscess', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Elective open cholecystectomy for cholelithiasis", 'role': 'assistant'}]