<prompt> Virus most sensitive to inactivation by biocides ?AdenovirusHerpes virusParvovirusPoliovirus  <response>: Ans. is b i.e., Herpes virus Enveloped viruses are most sensitive to inactivation by biocides. Among the given options only Herpesvirus is enveloped virus. Adenovirus, parvovirus and poliovirus picornavirus are non-enveloped viruses. 