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
Viruses can be cultured in all except: 
Select and explain. 
A. Chick embryo, B. Blood agar, C. Guinea pigs, D. Cell culture
B: Blood agar
Answer: B: Blood agar 
Explanation: None