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': 'Use of all the following significantly decreases airborne infection in operating room except ? \nSelect and explain. \nA. Laminar air flow, B. Air-conditioning, C. Ultraviolet light, D. Microfilters', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Air-conditioning", 'role': 'assistant'}]