<prompt> Which of the following drug causes additive anaemia and neutropenia if given to an AIDS patient on zidovudine?AcyclovirAmantidineGanciclovirStavudine  <response>: Gancyclovir is an antiviral drug used to treat cytomegalo virus. Zidovudine also known as azidothymidine a anti retro viral drug used in treatment of HIV. Gancyclovir shouldnot be combined with zidovudine since both have bone marrow suppressant propeies Ref:KDT6e p 770 