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
[{'content': 'Filgrastim is a : \nSelect and explain. \nA. T–cell stimulating factor, B. GnRH analogue, C. G–CSF, D. GM–CSF', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]