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': 'Cold sterilization refers to the process of sterilization by use of: \nSelect and explain. \nA. Ultraviolet rays, B. Ultrasonic vibrations, C. Infrared rays, D. Gamma rays', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Since there is no detectable increase of temperature in this method, this method is commonly referred to as “cold sterilization”.\nIonizing radiations include (a) X-rays, (b) Gamma rays, and (c) Cosmic rays.\xa0\n\nIonizing radiation is an excellent sterilizing agent with very high penetrating power.\nThese radiations penetrate deep into objects and destroy bacterial endospores and vegetative cells, both prokaryotic and eukaryotic. These are, however, not that effective against viruses.\nGamma radiation from a cobalt-60 source is used for sterilization of antibiotics, hormones, sutures, catheters, animal feeds, metal foils, and plastic disposables, such as syringes. This has also been used to sterilize and “pasteurize” meat and other food items.\n\nParija SC. Textbook of Microbiology & Immunology. Elsevier Health Sciences; 2014. Page:28', 'role': 'assistant'}]