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
All viruses can be cultured in 
Select and explain. 
A. Chemically defined media as that used for bacteria, B. Living systems only, C. Agar culture, D. Non living systems also
B: Living systems only
Answer: B: Living systems only 
Explanation: Viruses can be cultivated in living systems only.