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: Microbiology
[{'content': 'Irradiation can be used to sterilize all except \nSelect and explain. \nA. Bone graft, B. Suture, C. Artificial tissue graft, D. Bronchoscope', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]