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': 'Gamma radiations are used for sterilizing -( \nSelect and explain. \nA. Syringes, B. Cystoscopes, C. Dressing aprons, D. Metal instruments', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Syringes", 'role': 'assistant'}]