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': 'Capsid of viral structure is \nSelect and explain. \nA. Extracellular infectious particle, B. Protein coat around nucleic acid, C. Envelope around a virus, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]