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': 'Best method of sterilizing disposable syringes: \nSelect and explain. \nA. Hot air oven, B. U.V. rays, C. Gamma rays, D. Boiling', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]