This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiation, Subject name: Social & Preventive Medicine
Gamma rays are used for sterilization of: 
Select and explain. 
A. Catheters, B. Canulas, C. Syringes, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. (d) All of the aboveRef : K. Park 23rd ed. /127-128* Gamma radiation is used for sterilizing plastics, syringes, swabs, culture plates, catheter, rubber, oils, greases and metal foils.