<prompt> A HBsAg and anti-HBc IgG positive chronic hepatitis patient was also diagnosed to have HIV infection. Best drug to attack both the viruses isZidovudineTenofovirStavudineAbacavir  <response>: Ref. KDT. Page. 808Tenofovir is an adenine analog REVERSE TRANSCRIPTASE INHIBITOR with antiviral activity against HIV-1 and HEPATITIS B.It is used to treat HIV INFECTIONS and CHRONIC HEPATITIS B, in combination with other ANTIVIRAL AGENTS, due to the emergence of ANTIVIRAL DRUG RESISTANCE when it is used alone. 