Virus most sensitive to inactivation by biocides ?
Adenovirus
Herpes virus
Parvovirus
Poliovirus
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.