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': 'Interval cholecystectomy surgery is \nSelect and explain. \nA. Clean, B. Clean contaminated, C. Contaminated, D. Dirty', 'role': 'user'}, {'content': 'Answer: B \nExplanation: When there is no information but entry to genitourinary or gastrointestinal systems it is clean contaminated.', 'role': 'assistant'}]