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
Gamma irradiation used for all of the following except? 
Select and explain. 
A. Syringes, B. Catgut suture, C. Grafts, D. Endoscope
D: Endoscope
Answer: D: Endoscope 
Explanation: Ans. is 'd' i.e., Endoscope Radiation