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 viruses can be cultured in \nSelect and explain. \nA. Chemically defined media as that used for bacteria, B. Living systems only, C. Agar culture, D. Non living systems also', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Viruses can be cultivated in living systems only.', 'role': 'assistant'}]