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': 'Hot air oven cannot be used for sterilising: \nSelect and explain. \nA. Liquid paraffin, B. Instruments, C. Culture media, D. Needles', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]