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
Drug of choice for neutropenia due to cancer chemotherapy is : 
Select and explain. 
A. Vitamin B–12, B. IL–11, C. Filgrastim, D. Erythropoietin
C: Filgrastim
Answer: C: Filgrastim 
Explanation: None