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
An old woman is required to receive 4 cycles of cancer chemotherapy. After her first cycle, she developed chemotherapy-induced thrombocytopenia. Then in the next cycle, it would be appropriate to give this patient : 
Select and explain. 
A. Darbepoetin alpha, B. Filgrastim (G-CSF), C. Iron dextran, D. Oprelvekin (IL-11)
D: Oprelvekin (IL-11)
Answer: D: Oprelvekin (IL-11) 
Explanation: Oprelvekin acts like megakaryocyte colony stimulating factor and can be used to treat and prevent chemotherapy-induced thrombocytopenia.
Filgrastim (G-CSF) and sargramostim (GM-CSF) are used to prevent leucopenia.