This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
The Norwalk virus is a 
Select and explain. 
A. DNA virus, B. RNA virus, C. Prion, D. Bacteriophage induced virus
B: RNA virus
Answer: B: RNA virus 
Explanation: Viral gastroenteritis:FamilyVirusViral genomeReoviridaeRotavirusdsRNACalciviridaeNorovirus/Norwalk virusSapovirusss(+)RNAAdenoviridaeAdenovirusdsDNAAstroviridaeAstrovirusss(+)RNACoronaviridaeCoronavirusTorovirusss(+)RNAPicornaviridaeAichi virusss(+)RNAPicobirnaviridaePicobirnavirusdsRNAParvoviridaeBocavirusssDNAParamyxoviridaeHendra virusNipah v irusSs(-)RNA(Ref: Ananthanarayan 9th edition, 562)