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': 'Sterilisation is \nSelect and explain. \nA. Pathogens killed but spores are not affected, B. Only pathogenic micro-organisms killed, C. Non-pathogenic killed, D. All pathogenic and non-pathogenic microorganisms killed', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]