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': 'The best method of sterilization of dusting powder is- \nSelect and explain. \nA. Autoclaving, B. Hot air oven, C. Inspissation, D. Tyndallization', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]