Which is enveloped virus -: (A) Dengue virus, (B) Norwalk virus, (C) Hep A virus, (D) Adenovirus
Answer is A. Dengue virus (a member of flaviviridae) is an enveloped virus.
Adenovirus, norwalk virus (caliciviridae) and hepatitis A virus (Picornaviridae) are non-enveloped viruses.