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
Capsid of viral structure is 
Select and explain. 
A. Extracellular infectious particle, B. Protein coat around nucleic acid, C. Envelope around a virus, D. None of the above
B: Protein coat around nucleic acid
Answer: B: Protein coat around nucleic acid 
Explanation: None