This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Which of the following therapy is known to stimulate progenitor megakaryocytes and used in Rx of Cancer Chemotherapy-Induced Thrombocytopenia? 
Select and explain. 
A. IL-2, B. IL-6, C. IL-8, D. IL-11
D: IL-11
Answer: D: IL-11 
Explanation: IL-11 (oprelvekin) is approved for use in the setting of expected thrombocytopenia, but its effects on platelet counts are small, and it is associated with side effects such as headache, fever, malaise, syncope, cardiac arrhythmias, and fluid retention.