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': 'Which of the following is given to treat thrombocytopenia secondary to anticancer therapy and is known to stimulate progenitor megakaryocytes? \nSelect and explain. \nA. Filgrastim, B. Oprelvekin, C. Erythropoietin, D. Iron dextran', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Oprelvekin (IL-11) is used to prevent and treat thrombocytopenia.', 'role': 'assistant'}]