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B
Nucleoprotein
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C
Virion
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D
Capsid
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Solution
The correct option is D
Capsid
Viruses contain a protein coat called capsid that encloses a single type of nucleic acid, either RNA or DNA. The virion is a complete virus particle, consisting of RNA or DNA surrounded by a protein coat and is considered to be the infective form of a virus (while a virus is generally inactive by itself unless it enters the host cell).