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': 'All are not true for cultivation of anaerobic organisms except \nSelect and explain. \nA. Incubator, B. anaerobic jar, C. Refrigerator, D. centrifuge', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]