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. ultra violet rays, B. Ultrasonic vibrations, C. Infrared rays, D. Gamma rays', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]