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': "Which of the following fulfil all the criterias of Koch's postulates? \nSelect and explain. \nA. Treponema pallidum, B. Mycobacterium leprae, C. N. gonorrhoeae, D. None of the above", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]