This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which of the following drugs is most likely to cause additive anemia and neutropenia if administered to an AIDS patient taking zidovudine ? 
Select and explain. 
A. Acyclovir, B. Amantadine, C. Ganciclovir, D. Stavudine
C: Ganciclovir
Answer: C: Ganciclovir 
Explanation: None