This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology (Sterilization and Bacterial Genetics), Subject name: Microbiology
Irradiation can be used to sterilize all except : 
Select and explain. 
A. Bone graft, B. Suture, C. Aificial tissue graft, D. Bronchoscope
D: Bronchoscope
Answer: D: Bronchoscope 
Explanation: Bronchoscopes are sterilized by glutaraldehyde (Cidex). Gamma rays are used for sterilization of pre-packed disposable items, sutures, IV cannulas, urinary catheter, contraceptive devices, bone or tissue grafts