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
Sargramostim is a 
Select and explain. 
A. GM - CSF, B. G - CSF, C. IL - 11 analogue, D. Erythropoietin analogue
A: GM - CSF
Answer: A: GM - CSF 
Explanation: Sargramostim: GM - CSF analogue.
Filagastrim: G - CSF analogue.