This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
Which of the following drug causes additive anaemia and neutropenia if given to an AIDS patient on zidovudine? 
Select and explain. 
A. Acyclovir, B. Amantidine, C. Ganciclovir, D. Stavudine
C: Ganciclovir
Answer: C: Ganciclovir 
Explanation: 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:KDT6/e p 770