This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
Cold sterilization is - 
Select and explain. 
A. Sterilization by negative temperature, B. Sterilization by ionizing radiation, C. Sterilization by liquid CO?, D. Sterilization by non-ionizing radiation
B: Sterilization by ionizing radiation
Answer: B: Sterilization by ionizing radiation 
Explanation: Ans. is 'b' i.e., Sterilization by ionizing radiation[Ref: Ananthanarayan 9th/e p. 33 & 8th/ep. 35; Greenwood 16th/ep. 73}o Sterilization by Ionizing radiation does not cause increase in temperature - Cold sterilization.o Ionizing irradiation used for sterilization - Greenwood 16th/e p. 73y (photon) irradiationP (electrons) irradiationRadiationNonionizingIonizing Gamma rays Heat labile instruments:InfraredU. V. radiation# Prepacked items such as syringes & catheters# Enter Ways# Operation theaters# Laboratoriesplastics, syringes, swabs, greases, surgical catgut, bone & tissue graft